Goodwill and Intangibles Assets (Details 3) - USD ($) $ in Thousands  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018  | 
Jun. 30, 2017  | 
Jun. 30, 2018  | 
Jun. 30, 2017  | 
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| Finite-lived Intangible Assets [Roll Forward] | ||||
| Balance as of December 31, 2017 | $ 310,645 | |||
| Amortization | $ (17,014) | $ (14,660) | (34,028) | $ (19,362) | 
| Balance as of June 30, 2018 | $ 276,617 | $ 276,617 | ||
| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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