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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Accounting Policies [Abstract] |
Property and Equipment, Useful Lives | Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:
Furniture and fixtures | 3 to 5 years
Computer hardware and software | 3 to 5 years
Leasehold improvements | 2 to 5 years (Lesser of lease term or useful life of improvement)
Schedule of Earnings Per Share, Basic and Diluted | The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:
|  | 2013 |  | 2012 |  | 2011
Numerator (in thousands): |  |  |  |  |  |
Basic |  |  |  |  |  |
Net income (loss) |  | $ | (56,434 | ) |  | $ | 59,453 |  |  | $ | 21,106 |
Undistributed earnings allocated to participating securities |  | — |  |  | (1,889 | ) |  | (841 | )
Total dividends paid |  | (18,633 | ) |  | — |  |  | — |
Dividends attributable to common stockholders |  | 18,122 |  |  | — |  |  | — |
Net income (loss) attributable to common stockholders – basic |  | $ | (56,945 | ) |  | $ | 57,564 |  |  | $ | 20,265 |
Diluted |  |  |  |  |  |
Net income (loss) |  | $ | (56,434 | ) |  | $ | 59,453 |  |  | $ | 21,106 |
Undistributed earnings allocated to participating securities |  | — |  |  | (1,876 | ) |  | (833 | )
Total dividends paid |  | (18,633 | ) |  | — |  |  | — |
Dividends attributable to common stockholders |  | 18,122 |  |  | — |  |  | — |
Net income (loss) attributable to common stockholders – diluted |  | $ | (56,945 | ) |  | $ | 57,577 |  |  | $ | 20,273 |
Denominator: |  |  |  |  |  |
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic |  | 48,155,832 |  |  | 47,251,061 |  |  | 39,743,433 |
Effect of potentially dilutive securities: |  |  |  |  |  |
Common stock options and restricted stock units |  | — |  |  | 333,059 |  |  | 407,167 |
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted |  | 48,155,832 |  |  | 47,584,120 |  |  | 40,150,600 |
Basic net income (loss) per common share |  | $ | (1.18 | ) |  | $ | 1.22 |  |  | $ | 0.51 |
Diluted net income (loss) per common share |  | $ | (1.18 | ) |  | $ | 1.21 |  |  | $ | 0.50 |
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share |  | 27,760 |  |  | 30,812 |  |  | 7,760 |
Impact of the Revision to the Comparable Prior Period Earnings (Loss) Per Share Calculations Using the Two-Class Method [Table Text Block] | The impact of the revision for the comparable prior period earnings (loss) per share calculations using the two-class method were as follows:
|  | 2012 |  | 2011
Numerator: |  |  |  |
Net income attributable to common stockholders – basic and diluted - As Reported |  | $ | 59,453 |  |  | $ | 21,106 |
Net income attributable to common stockholders – basic - As Adjusted |  | $ | 57,564 |  |  | $ | 20,265 |
Net income attributable to common stockholders – diluted - As Adjusted |  | $ | 57,577 |  |  | $ | 20,273 |
Denominator: |  |  |  |
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Reported |  | 47,251,061 |  |  | 39,743,433 |
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Adjusted |  | 47,251,061 |  |  | 39,743,433 |
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Reported |  | 48,060,647 |  |  | 41,258,297 |
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Adjusted |  | 47,584,120 |  |  | 40,150,600 |
Basic net income per common share - As Reported |  | $ | 1.26 |  |  | $ | 0.53 |
Basic net income per common share - As Adjusted |  | $ | 1.22 |  |  | $ | 0.51 |
Diluted net income per common share - As Reported |  | $ | 1.24 |  |  | $ | 0.51 |
Diluted net income per common share - As Adjusted |  | $ | 1.21 |  |  | $ | 0.50 |

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