Summary of Significant Accounting Policies (Tables)

12 Months Ended

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