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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
Balance at beginning of period at Dec. 31, 2015 $ 1,146,265 $ 782 $ 1,695,956 $ 91,993 $ 1,018,683 $ (1,661,149)
Beginning balance (in shares) at Dec. 31, 2015   78,162,765        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 131,252       131,252  
Other comprehensive income (loss) (20,140)     (20,140)    
Employee stock purchase and incentive plans (7,025) $ 5 (7,030)      
Employee stock purchase and incentive plans (in shares)   614,952        
Non-cash equity award compensation 12,648   12,648      
Share repurchases (25,107) $ (19) (25,088)      
Share repurchases (in shares)   (1,943,054)        
Common dividends declared (88,465)         (88,465)
Balance at End of Period at Dec. 31, 2016 1,149,428 $ 768 1,676,486 71,853 1,149,935 (1,749,614)
Ending balance (in shares) at Dec. 31, 2016   76,834,663        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 140,406       140,406  
Other comprehensive income (loss) 13,395     13,395    
Employee stock purchase and incentive plans (3,834) $ 4 (3,838)      
Employee stock purchase and incentive plans (in shares)   375,651        
Non-cash equity award compensation 10,378   10,378      
Share repurchases (9,187) $ (6) (9,181)      
Share repurchases (in shares)   (610,342)        
Common dividends declared (88,299)         (88,299)
Balance at End of Period 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 [Roll Forward]            
Net income 119,600       119,600  
Other comprehensive income (loss) (23,951)     (23,951)    
Issuance of common stock 142,228 $ 88 142,140      
Issuance of common stock (in shares)   8,738,319        
Dividend reinvestment & stock purchase plans 1,706 $ 1 1,705      
Dividend reinvestment & stock purchase plans (in shares)   113,004        
Employee stock purchase and incentive plans (4,466) $ 4 (4,470)      
Employee stock purchase and incentive plans (in shares)   473,878        
Non-cash equity award compensation 13,736   13,736      
Share repurchases (15,544) $ (10) (15,534)      
Share repurchases (in shares)   (1,040,829)        
Common dividends declared (96,802)         (96,802)
Balance at End of Period at Dec. 31, 2018 $ 1,348,794 $ 849 $ 1,811,422 $ 61,297 $ 1,409,941 $ (1,934,715)
Ending balance (in shares) at Dec. 31, 2018   84,884,344