Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Series A Preferred Stock
Preferred Stock
Preferred Stock
Series A Preferred Stock
Common Stock
Capital in Excess of Par Value
Accumulated Deficit
AOCL
Preferred shares outstanding, beginning of period at Dec. 31, 2015     0          
Common shares outstanding, beginning of period at Dec. 31, 2015         88,364,473      
Balances, beginning of period at Dec. 31, 2015 $ 3,461,874   $ 0   $ 4,418 $ 4,721,323 $ (1,262,839) $ (1,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 97,446           97,446  
Net income attributable to common stockholders/ after preferred distributions 97,446              
Other comprehensive income (loss) 1,028             1,028
Dividends declared on common stock 333,180           333,180  
Tax withholdings related to net stock settlements (in shares)         (14,566)      
Tax withholdings related to net stock settlements (753)       $ (1)   (752)  
Issuance of stock (in shares)         8,167,072      
Issuance of stock 446,613       $ 408 446,205    
Stock-based compensation, net (in shares)         208,326      
Stock-based compensation, net 9,080       $ 11 9,558 (489)  
Preferred shares outstanding, end of period at Dec. 31, 2016     0          
Common shares outstanding, end of period at Dec. 31, 2016         96,725,305      
Balances, end of period at Dec. 31, 2016 3,682,108   $ 0   $ 4,836 5,177,086 (1,499,814) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 77,148           77,148  
Dividends declared on preferred stock (2,530)           (2,530)  
Net income attributable to common stockholders/ after preferred distributions 74,618           74,618  
Dividends declared on common stock 332,402           332,402  
Tax withholdings related to net stock settlements (in shares)         (88,062)      
Tax withholdings related to net stock settlements (3,542)       $ (4)   (3,538)  
Issuance of stock (in shares)       6,900,000        
Issuance of stock   $ 166,193   $ 166,193        
Repurchase of common shares (in shares)         (7,167,993)      
Repurchase of common shares (283,089)       $ (358)   (282,731)  
Stock-based compensation, net (in shares)         304,885      
Stock-based compensation, net $ 15,723       $ 15 16,545 (837)  
Preferred shares outstanding, end of period at Dec. 31, 2017 6,900,000   6,900,000          
Common shares outstanding, end of period at Dec. 31, 2017 89,774,135       89,774,135      
Balances, end of period at Dec. 31, 2017 $ 3,319,609   $ 166,193   $ 4,489 5,193,631 (2,044,704) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 132,052           132,052  
Dividends declared on preferred stock (10,352)           (10,352)  
Net income attributable to common stockholders/ after preferred distributions 121,700           121,700  
Other comprehensive income (loss) (7,159)             (7,159)
Cost associated with preferred stock   $ (16)   $ (16)        
Dividends declared on common stock $ 262,887           262,887  
Tax withholdings related to net stock settlements (in shares) (57,700)       (57,679)      
Tax withholdings related to net stock settlements $ (2,403)       $ (3)   (2,400)  
Issuance of stock (in shares)         92,458      
Issuance of stock 2,972       $ 5 2,967    
Repurchase of common shares (in shares)         (4,244,446)      
Repurchase of common shares (168,165)       $ (212)   (167,953)  
SMTA dividend distribution (216,005)         (216,005)    
Stock-based compensation, net (in shares)         222,887      
Stock-based compensation, net $ 14,103       $ 10 15,104 (1,011)  
Preferred shares outstanding, end of period at Dec. 31, 2018 6,900,000   6,900,000          
Common shares outstanding, end of period at Dec. 31, 2018 85,787,355       85,787,355      
Balances, end of period at Dec. 31, 2018 $ 2,801,749   $ 166,177   $ 4,289 $ 4,995,697 $ (2,357,255) $ (7,159)