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Equity - Narrative (Details) - USD ($)
 12 Months Ended 33 Months Ended
Jul. 14, 2014
Sep. 23, 2013
Dec. 27, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 31, 2016
Oct. 31, 2013
Class of Stock [Line Items]                
Payments for repurchase of equity $ 72,300,000              
Share repurchase program, authorized amount of repurchase               $ 500,000,000
Repurchase of common stock, value (in dollars)       $ 5,890,000 $ 4,142,000 $ 382,487,000 $ 380,300,000  
Repurchase of common stock (in shares)       991,985     13,163,793  
Homeward Acquisition [Member]                
Class of Stock [Line Items]                
Payments for repurchase of equity   $ 157,900,000            
Shares issued upon election (in shares) 1,950,296 3,145,640            
Homeward Acquisition [Member] | Series A Perpetual Convertible Preferred Stock [Member]                
Class of Stock [Line Items]                
Number of convertible shares remaining (in shares) 62,000 100,000            
Preferred shares issued (in shares)     162,000          
Preferred stock, par value (in dollars per share)     $ 0.01          
Preferred stock, dividend rate     3.75%          
Preferred stock, dividend rate, per-dollar-amount     $ 1,000          
Conversion price (in dollars per share)     $ 31.79