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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
 
2015
 
2014
 
2013
Numerator (in thousands):
 
 
 
 
 
 
Basic and Diluted
 
 
 
 
 
 
Net loss
 
$
(160,036
)
 
$
(66,029
)
 
$
(56,434
)
Total dividends declared / paid
 
(25,434
)
 
(25,039
)
 
(18,633
)
Dividends attributable to common stockholders
 
24,740

 
24,313

 
18,122

Net loss attributable to common stockholders – basic and diluted
 
$
(160,730
)
 
$
(66,755
)
 
$
(56,945
)
 
 
 
 
 
 
 
Weighted-average shares used in computing net loss per share attributable to common stockholders – basic and diluted
 
49,505,817

 
48,658,088

 
48,155,832

 
 
 
 
 
 
 
Basic and diluted net loss per common share
 
$
(3.25
)
 
$
(1.37
)
 
$
(1.18
)
Anti-dilutive equity-based incentive awards excluded from the computation of diluted loss per share
 
71,468

 
27,760

 
27,760