| Goodwill and Intangible Assets Tables (Tables)
 | 12 Months Ended | 
| Dec. 31, 2018 | 
|---|
| Goodwill and Intangible Assets Disclosure [Abstract] |  | 
| Schedule of Goodwill [Table Text Block] | 
The following table presents the changes in the carrying amount of goodwill for the periods indicated:     
|  |  
|  |  |  |  |  |  |  |  |  
|   | Years Ended December 31, |  
|   | 2018 |   | 2017 |  
|   | (in thousands) |  
| Beginning balance | $ | 237,992 | 
 |   | $ | 76,015 | 
 |  
| Acquisitions | — | 
 |   | 162,318 | 
 |  
| Adjustments | 338 | 
 |   | (341 | ) |  
| Ending balance | $ | 238,330 | 
 |   | $ | 237,992 | 
 |  | 
| Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] | 
The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions and other purchases, which continue to be amortized: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   |   | December 31, 2018 |   | December 31, 2017 |  
|   | Weighted Average Useful Life (in Years) |   | Gross Carrying Amount |   | Accumulated Amortization |   | Net Carrying Amount |   | Gross Carrying Value |   | Accumulated Amortization |   | Net Carrying Amount |  
|   |   |   | (in thousands) |  
| Licensed technology | 3.7 |   | $ | 2,070 | 
 |   | $ | (1,130 | ) |   | $ | 940 | 
 |   | $ | 2,070 | 
 |   | $ | (575 | ) |   | $ | 1,495 | 
 |  
| Developed technology | 6.9 |   | 238,961 | 
 |   | (74,630 | ) |   | 164,331 | 
 |   | 241,561 | 
 |   | (39,252 | ) |   | 202,309 | 
 |  
| Trademarks and trade names | 6.1 |   | 13,800 | 
 |   | (4,252 | ) |   | 9,548 | 
 |   | 13,800 | 
 |   | (1,992 | ) |   | 11,808 | 
 |  
| Customer relationships | 4.6 |   | 121,100 | 
 |   | (55,647 | ) |   | 65,453 | 
 |   | 121,100 | 
 |   | (26,661 | ) |   | 94,439 | 
 |  
| Non-compete covenants | 3.0 |   | 1,100 | 
 |   | (872 | ) |   | 228 | 
 |   | 1,100 | 
 |   | (506 | ) |   | 594 | 
 |  
|   | 6.1 |   | $ | 377,031 | 
 |   | $ | (136,531 | ) |   | $ | 240,500 | 
 |   | $ | 379,631 | 
 |   | $ | (68,986 | ) |   | $ | 310,645 | 
 |  | 
| Finite-lived Intangible Assets Amortization Expense [Table Text Block] | 
The following table sets forth amortization expense associated with finite-lived intangible assets, which is included in the consolidated statements of operations as follows:
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   | Years Ended December 31, |  
|   |   | 2018 |   | 2017 |   | 2016 |  
|   | (in thousands) |  
| Cost of net revenue |   | $ | 35,821 | 
 |   | $ | 25,316 | 
 |   | $ | 8,512 | 
 |  
| Research and development |   | 150 | 
 |   | 551 | 
 |   | 619 | 
 |  
| Selling, general and administrative |   | 31,976 | 
 |   | 28,827 | 
 |   | 6,953 | 
 |  
|   |   | $ | 67,947 | 
 |   | $ | 54,694 | 
 |   | $ | 16,084 | 
 |  | 
| Schedule of Finite-Lived Intangible Assets [Table Text Block] | 
 
The following table sets forth activity during the years ended December 31, 2018 and 2017 related to finite-lived intangible assets:
|  |  
|  |  |  |  |  |  |  |  |  
|   | Years Ended December 31, |  
|   | 2018 |   | 2017 |  
|   | (in thousands) |  
| Beginning balance | $ | 310,645 | 
 |   | $ | 81,861 | 
 |  
| Acquisitions | — | 
 |   | 245,500 | 
 |  
| Other additions | — | 
 |   | 5,378 | 
 |  
| Transfers to developed technology from IPR&D | — | 
 |   | 32,600 | 
 |  
| Amortization | (67,947 | ) |   | (54,694 | ) |  
| Impairment losses | (2,198 | ) |   | — | 
 |  
| Ending balance | $ | 240,500 | 
 |   | $ | 310,645 | 
 |  | 
| Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | 
The following table presents future amortization of the Company’s finite-lived intangible assets at December 31, 2018:
|  |  
|  |  |  |  |  
|   | Amortization (in thousands) |  
| 2019 | $ | 56,819 | 
 |  
| 2020 | 55,954 | 
 |  
| 2021 | 55,171 | 
 |  
| 2022 | 37,641 | 
 |  
| 2023 | 25,446 | 
 |  
| Thereafter | 9,469 | 
 |  
| Total | $ | 240,500 | 
 |  | 
| Schedule of Indefinite-Lived Intangible Assets [Table Text Block] | 
The following table sets forth the Company’s activities related to the indefinite-lived intangible assets:
|  |  
|  |  |  |  |  |  |  |  |  
|   | Years Ended December 31, |  
|   | 2018 |   | 2017 |  
|   | (in thousands) |  
| Beginning balance | $ | 4,400 | 
 |   | $ | 22,400 | 
 |  
| Acquisitions | — | 
 |   | 16,600 | 
 |  
| Transfers to developed technology from IPR&D | — | 
 |   | (32,600 | ) |  
| Impairment losses | — | 
 |   | (2,000 | ) |  
| Ending balance | $ | 4,400 | 
 |   | $ | 4,400 | 
 |  
 |