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Equity - Narrative (Details) - USD ($)
 9 Months Ended 12 Months Ended 14 Months Ended
Jul. 14, 2014
Sep. 23, 2013
Mar. 28, 2012
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Oct. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]                  
Outstanding principal balance, converted     $ 56,400,000            
Stated percentage of convertible notes                 3.25%
Shares converted (in shares)     4,635,159            
Shares issued upon election (in shares)   3,145,640              
Number of convertible shares remaining (in shares) 62,000 100,000              
Repurchase of common stock amount $ 72,300,000     $ 325,609,000 $ 382,487,000 $ 217,903,000      
Repurchase of common stock (in shares) 1,950,296       10,420,396   11,546,103    
Authorized share amount for share repurchase program               $ 500,000,000  
Purchase price         $ 310,200,000   $ 370,300,000    
Debt Securities Convertible Notes [Member]                  
Class of Stock [Line Items]                  
Stated percentage of convertible notes         3.25%   3.25%    
Homeward Acquisition [Member]                  
Class of Stock [Line Items]                  
Payments for repurchase of equity $ 72,300,000 $ 157,900,000              
Shares issued upon election (in shares) 1,950,296 3,145,640