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Consolidated Statements of Changes in Equity (unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2016   61,031      
Beginning Balance at Dec. 31, 2016 $ 960,038 $ 122,062 $ 219,955 $ 685,504 $ (67,483)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 18,785     18,785  
Other comprehensive income (loss) 5,838       5,838
Dividends declared (15,698)     (15,698)  
Share-based compensation expense, exercises and other (in shares)   171      
Share-based compensation expense, exercises and other 994 $ 341 653    
Ending Balance (in shares) at Mar. 31, 2017   61,202      
Ending Balance at Mar. 31, 2017 $ 969,957 $ 122,403 220,608 688,591 (61,645)
Beginning Balance (in shares) at Dec. 31, 2017 61,476 61,476      
Beginning Balance at Dec. 31, 2017 $ 1,015,479 $ 122,952 226,937 690,674 (25,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 8,151     8,151  
Other comprehensive income (loss) 9,307       9,307
Dividends declared (16,027)     (16,027)  
Share-based compensation expense, exercises and other (in shares)   336      
Share-based compensation expense, exercises and other $ 2,008 $ 672 1,336    
Ending Balance (in shares) at Mar. 31, 2018 61,812 61,812      
Ending Balance at Mar. 31, 2018 $ 1,018,918 $ 123,624 $ 228,273 $ 682,798 $ (15,777)