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Earnings per Common Share - Basic Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 32,882 $ 40,813
Income attributable to preferred stock (972) (1,165)
Income attributable to common stock subject to repurchase 0 (81)
Net income allocated to Class A common stockholders $ 31,910 $ 39,567
Weighted-average Class A shares issued and outstanding 49,863 51,448
Basic earnings per Class A common share, in usd per share $ 0.64 $ 0.77
Re-allocated earnings $ 19 $ 11
Diluted net income allocated to Class A common stockholders $ 31,929 $ 39,578
Diluted weighted-average Class A shares issued and outstanding 50,867 51,938
Diluted earnings per Class A common share, in usd per share $ 0.63 $ 0.76
Stock Options [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Dilutive potential common shares 343 281
Restricted Stock Units (RSUs) [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Dilutive potential common shares 630 193
Employee Stock Purchase Plan [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Dilutive potential common shares 31 16
Common Class A [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted-average Class A shares issued and outstanding 49,863 51,448
Basic earnings per Class A common share, in usd per share $ 0.64 $ 0.77
Diluted weighted-average Class A shares issued and outstanding 50,867 51,938
Diluted earnings per Class A common share, in usd per share $ 0.63 $ 0.76