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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Cumulative Earnings
Cumulative Distributions to Stockholders
Beginning balance at Dec. 31, 2016 $ 1,149,428 $ 768 $ 1,676,486 $ 71,853 $ 1,149,935 $ (1,749,614)
Beginning balance (in shares) at Dec. 31, 2016   76,834,663        
Increase (Decrease) in Stockholders' Equity            
Net Income 109,473       109,473  
Other comprehensive income (loss) 10,463     10,463    
Employee stock purchase and incentive plans (2,312) $ 3 (2,315)      
Employee stock purchase and incentive plans (in shares)   288,024        
Non-cash equity award compensation 7,797   7,797      
Common dividends declared (66,209)         (66,209)
Ending balance at Sep. 30, 2017 1,208,640 $ 771 1,681,968 82,316 1,259,408 (1,815,823)
Ending balance (in shares) at Sep. 30, 2017   77,122,687        
Beginning balance at Dec. 31, 2016 1,149,428 $ 768 1,676,486 71,853 1,149,935 (1,749,614)
Beginning balance (in shares) at Dec. 31, 2016   76,834,663        
Ending balance at Dec. 31, 2017 1,212,287 $ 766 1,673,845 85,248 1,290,341 (1,837,913)
Ending balance (in shares) at Dec. 31, 2017   76,599,972        
Increase (Decrease) in Stockholders' Equity            
Net Income 36,180          
Other comprehensive income (loss) 12,640          
Ending balance at Sep. 30, 2017 1,208,640 $ 771 1,681,968 82,316 1,259,408 (1,815,823)
Ending balance (in shares) at Sep. 30, 2017   77,122,687        
Beginning balance at Dec. 31, 2017 1,212,287 $ 766 1,673,845 85,248 1,290,341 (1,837,913)
Beginning balance (in shares) at Dec. 31, 2017   76,599,972        
Increase (Decrease) in Stockholders' Equity            
Net Income 120,513       120,513  
Other comprehensive income (loss) (12,921)     (12,921)    
Issuance of common stock 117,036 $ 72 116,964      
Issuance of common stock (in shares)   7,187,500        
Employee stock purchase and incentive plans (100) $ 1 (101)      
Employee stock purchase and incentive plans (in shares)   183,638        
Non-cash equity award compensation 10,783   10,783      
Share repurchases (15,544) $ (10) (15,534)      
Share repurchases (in shares)   (1,040,829)        
Common dividends declared (70,727)         (70,727)
Ending balance at Sep. 30, 2018 1,361,327 $ 829 1,785,957 72,327 1,410,854 (1,908,640)
Ending balance (in shares) at Sep. 30, 2018   82,930,281        
Increase (Decrease) in Stockholders' Equity            
Net Income 40,921          
Other comprehensive income (loss) (3,293)          
Ending balance at Sep. 30, 2018 $ 1,361,327 $ 829 $ 1,785,957 $ 72,327 $ 1,410,854 $ (1,908,640)
Ending balance (in shares) at Sep. 30, 2018   82,930,281