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Stock-Based Compensation and Employee Benefit Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified |
6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
Employee
|
Dec. 31, 2011
|
Jun. 30, 2012
Class A Common Stock [Member]
Votes
|
Dec. 31, 2011
Class A Common Stock [Member]
|
Jun. 30, 2012
Common Class B [Member]
Votes
|
Dec. 31, 2011
Common Class B [Member]
|
Jun. 30, 2012
Restricted Stock Units [Member]
|
Jun. 30, 2011
Restricted Stock Units [Member]
|
May 31, 2012
Restricted Stock Units [Member]
Class A Common Stock [Member]
|
Jun. 30, 2012
Restricted Stock Awards [Member]
|
Jun. 30, 2011
Restricted Stock Awards [Member]
|
Dec. 31, 2011
Equity Incentive Plan [Member]
|
Jun. 30, 2012
Employee Stock Purchase Plan [Member]
|
Mar. 31, 2012
Employee Stock Purchase Plan [Member]
|
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||
| Weighted-average grant date fair value per share | $ 5.90 | $ 9.02 | $ 5.90 | $ 0.00 | |||||||||||
| Shares authorized for issuance | 1,329,000 | 415,000 | |||||||||||||
| Contribution of earnings by employees | 15.00% | ||||||||||||||
| Percentage of purchase of common stock | 85.00% | ||||||||||||||
| Percentage of common stock on the date of purchase | 85.00% | ||||||||||||||
| Common stock, shares authorized | 550,000,000 | 550,000,000 | 500,000,000 | 500,000,000 | 500,000,000 | 500,000,000 | |||||||||
| Voting rights per share | 1 | 10 | |||||||||||||
| Number of convertible common stock | 1 | ||||||||||||||
| Eligible options to purchase shares | 1,327,171 | 591,242 | |||||||||||||
| Eligible employees to purchase common Stock | 148 | ||||||||||||||
| Company's Class A common stock issuable upon vesting of RSU | 1 | ||||||||||||||
| Period of options granted | 4 years | 3 years | |||||||||||||
| Stock-Based Compensation and Employee Benefit Plans (Textual) [Abstract] | |||||||||||||||
| Exercise price per share | $ 5 | ||||||||||||||
| Restricted stock units Issued | 959,222 | ||||||||||||||
| Vesting period for new restricted stock units | 4 years | 3 years | |||||||||||||
| Percentage of fair value market of common stock | 100.00% | ||||||||||||||
| Term of option granted, minimum | 7 years | ||||||||||||||
| Term of option granted, maximum | 10 years | ||||||||||||||
| Incremental value attributed to the modified options | $ 1.8 | ||||||||||||||
| Share based compensation expense Exchange Offer | $ 7.3 | ||||||||||||||