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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Cumulative Earnings
Cumulative Distributions to Stockholders
Beginning balance (in shares) at Dec. 31, 2018   84,884,344        
Balance at beginning of period at Dec. 31, 2018 $ 1,348,794 $ 849 $ 1,811,422 $ 61,297 $ 1,409,941 $ (1,934,715)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 169,183       169,183  
Other comprehensive income (loss) (19,784)     (19,784)    
Issuance of common stock (in shares)   28,724,645        
Issuance of common stock 442,172 $ 288 441,884      
Direct stock purchase and dividend reinvestment plan (in shares)   399,838        
Direct stock purchase and dividend reinvestment plan 6,307 $ 4 6,303      
Employee stock purchase and incentive plans (in shares)   344,209        
Employee stock purchase and incentive plans (4,946) $ 3 (4,949)      
Non-cash equity award compensation 14,957   14,957      
Share repurchases (in shares)   0        
Share repurchases 0 $ 0 0      
Common dividends declared (129,452)         (129,452)
Ending balance (in shares) at Dec. 31, 2019   114,353,036        
Balance at End of Period at Dec. 31, 2019 1,827,231 $ 1,144 2,269,617 41,513 1,579,124 (2,064,167)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (581,847)       (581,847)  
Other comprehensive income (loss) (45,734)     (45,734)    
Issuance of common stock (in shares)   350,088        
Issuance of common stock 5,547 $ 3 5,544      
Direct stock purchase and dividend reinvestment plan (in shares)   0        
Direct stock purchase and dividend reinvestment plan 0 $ 0 0      
Employee stock purchase and incentive plans (in shares)   434,217        
Employee stock purchase and incentive plans (3,952) $ 4 (3,956)      
Non-cash equity award compensation 15,298   15,298      
Share repurchases (in shares)   (3,047,335)        
Share repurchases (21,659) $ (30) (21,629)      
Common dividends declared (83,985)         (83,985)
Ending balance (in shares) at Dec. 31, 2020   112,090,006        
Balance at End of Period at Dec. 31, 2020 1,110,899 $ 1,121 2,264,874 (4,221) 997,277 (2,148,152)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 319,613       319,613  
Other comprehensive income (loss) (4,706)     (4,706)    
Issuance of common stock (in shares)   2,503,662        
Issuance of common stock 34,708 $ 25 34,683      
Direct stock purchase and dividend reinvestment plan (in shares)   119,040        
Employee stock purchase and incentive plans (in shares)   298,641        
Employee stock purchase and incentive plans (1,657) $ 3 (1,660)      
Non-cash equity award compensation 18,902   18,902      
Share repurchases (in shares)   0        
Share repurchases 0 $ 0 0      
Common dividends declared (91,672)         (91,672)
Ending balance (in shares) at Dec. 31, 2021   114,892,309        
Balance at End of Period at Dec. 31, 2021 $ 1,386,087 $ 1,149 $ 2,316,799 $ (8,927) $ 1,316,890 $ (2,239,824)