Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Capital in Excess of Par Value
Accumulated Deficit
AOCL
Beginning balance, value at Dec. 31, 2017 $ 3,319,609 $ 166,193 $ 4,489 $ 5,193,631 $ (2,044,704) $ 0
Preferred shares outstanding, beginning balance at Dec. 31, 2017   6,900,000        
Common shares outstanding, beginning balance at Dec. 31, 2017     89,774,135      
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)
Issuance of stock 2,972   $ 5 2,967    
Issuance of stock (in shares)     92,458      
Cost associated with preferred stock (16) $ (16)        
Dividends declared on common stock (262,887)       (262,887)  
Tax withholdings related to net stock settlements $ (2,403)   $ (3)   (2,400)  
Tax withholdings related to net stock settlements (in shares) (58,000)   (57,679)      
Repurchase of common shares $ (168,165)   $ (212)   (167,953)  
Repurchase of common shares (in shares)     (4,244,446)      
SMTA dividend distribution (216,005)     (216,005)    
Stock-based compensation, net 14,103   $ 10 15,104 (1,011)  
Stock-based compensation, net (in shares)     222,887      
Ending balance, value at Dec. 31, 2018 2,801,749 $ 166,177 $ 4,289 4,995,697 (2,357,255) (7,159)
Preferred shares outstanding, ending balance at Dec. 31, 2018   6,900,000        
Common shares outstanding, ending balance at Dec. 31, 2018     85,787,355      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 175,266       175,266  
Dividends declared on preferred stock (10,350)       (10,350)  
Net income attributable to common stockholders/after preferred distributions 164,916       164,916  
Other comprehensive income (loss) (4,302)         (4,302)
Issuance of stock 677,190   $ 829 676,361    
Issuance of stock (in shares)     16,578,423      
Dividends declared on common stock (236,943)       (236,943)  
Tax withholdings related to net stock settlements $ (2,542)   $ (3)   (2,539)  
Tax withholdings related to net stock settlements (in shares) (58,000)   (58,445)      
Stock-based compensation, net $ 13,260   $ 9 14,268 (1,017)  
Stock-based compensation, net (in shares)     168,819      
Other (79)     (79)    
Ending balance, value at Dec. 31, 2019 $ 3,413,249 $ 166,177 $ 5,124 5,686,247 (2,432,838) (11,461)
Preferred shares outstanding, ending balance at Dec. 31, 2019 6,900,000 6,900,000        
Common shares outstanding, ending balance at Dec. 31, 2019     102,476,152      
Common shares outstanding, beginning balance at Dec. 31, 2019 102,476,152          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 26,708       26,708  
Dividends declared on preferred stock (10,350)       (10,350)  
Net income attributable to common stockholders/after preferred distributions 16,358       16,358  
Other comprehensive income (loss) 2,807         2,807
Issuance of stock 428,239   $ 607 427,632    
Issuance of stock (in shares)     12,137,210      
Dividends declared on common stock (266,659)       (266,659)  
Tax withholdings related to net stock settlements $ (4,381)   $ (6)   (4,375)  
Tax withholdings related to net stock settlements (in shares) (117,500)   (117,543)      
Stock-based compensation, net $ 11,507   $ 16 12,624 (1,133)  
Stock-based compensation, net (in shares)     316,796      
Ending balance, value at Dec. 31, 2020 $ 3,601,120 $ 166,177 $ 5,741 $ 6,126,503 $ (2,688,647) $ (8,654)
Preferred shares outstanding, ending balance at Dec. 31, 2020 6,900,000 6,900,000        
Common shares outstanding, ending balance at Dec. 31, 2020     114,812,615