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Equity - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended 38 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Oct. 31, 2013
Class of Stock [Line Items]            
Share repurchase program, authorized amount of repurchase           $ 500,000,000
Repurchase of common stock (in shares)     991,985   13,163,793  
Repurchase of common stock, value (in dollars)     $ 5,890,000 $ 4,142,000 $ 380,300,000  
Issuance of common stock   $ 15,325,000        
NRZ [Member]            
Class of Stock [Line Items]            
Issuance of common stock   $ 13,900,000        
Issuance of common stock, shares   6,075,510        
Securities Class Action [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares   625,000        
Common stock to be issued in connection with mediated settlement of litigation   2,500,000        
Securities Class Action [Member] | Subsequent Event [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares 1,875,000