Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Capital in Excess of Par Value
Accumulated Deficit
AOCL
Preferred shares outstanding, beginning balance at Dec. 31, 2017   6,900,000        
Beginning balance, value at Dec. 31, 2017 $ 3,319,609 $ 166,193 $ 4,489 $ 5,193,631 $ (2,044,704) $ 0
Common shares outstanding, beginning balance at Dec. 31, 2017     89,774,135      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 30,718       30,718  
Dividends declared on preferred stock (2,588)       (2,588)  
Net income available to common stockholders 28,130       28,130  
Dividends declared on common stock (78,581)       (78,581)  
Tax withholdings related to net stock settlements (in shares)     (12,188)      
Tax withholdings related to net stock settlements (484)       (484)  
Repurchase of common shares (in shares)     (2,632,210)      
Repurchase of common shares (104,042)   $ (132)   (103,910)  
Stock-based compensation, net (in shares)     183,081      
Stock-based compensation, net 4,091   $ 9 4,357 (275)  
Preferred shares outstanding, ending balance at Mar. 31, 2018   6,900,000        
Ending balance, value at Mar. 31, 2018 $ 3,168,723 $ 166,193 $ 4,366 5,197,988 (2,199,824) 0
Common shares outstanding, ending balance at Mar. 31, 2018     87,312,818      
Preferred shares outstanding, beginning balance at Dec. 31, 2018 6,900,000 6,900,000        
Beginning balance, value at Dec. 31, 2018 $ 2,801,749 $ 166,177 $ 4,289 4,995,697 (2,357,255) (7,159)
Common shares outstanding, beginning balance at Dec. 31, 2018     85,787,355      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 43,578       43,578  
Dividends declared on preferred stock (2,588)       (2,588)  
Net income available to common stockholders 40,990       40,990  
Other comprehensive loss (5,021)         (5,021)
Dividends declared on common stock $ (54,254)       (54,254)  
Tax withholdings related to net stock settlements (in shares) (18,000)   (17,800)      
Tax withholdings related to net stock settlements $ (704)   $ (1)   (703)  
Issuance of shares of common stock, net (in shares)     893,526      
Issuance of shares of common stock, net 32,686   $ 45 32,641    
Other (79)     (79)    
Stock-based compensation, net (in shares)     148,705      
Stock-based compensation, net $ 3,269   $ 8 3,570 (309)  
Preferred shares outstanding, ending balance at Mar. 31, 2019 6,900,000 6,900,000        
Ending balance, value at Mar. 31, 2019 $ 2,818,636 $ 166,177 $ 4,341 $ 5,031,829 $ (2,371,531) $ (12,180)
Common shares outstanding, ending balance at Mar. 31, 2019     86,811,786