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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss), net of tax
Redeemable Noncontrolling Interest in Subsidiaries/ Temporary Equity
Balance, beginning of period at Dec. 31, 2017 $ 761,215 $ 343,378 $ 697,359 $ (278,732) $ (790)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 60,331   60,331     $ (325)
Other Comprehensive Income (Loss), net of tax 277       277  
Stock Award Activity 7,067 6,966 (10,721) 10,822    
Dividends Declared (25,265)   (25,265)      
Purchase of Treasury Stock (3,876)     (3,876)    
Balance, end of period at Mar. 31, 2018 799,620 350,344 721,829 (271,786) (767)  
Balance, beginning of period, Temporary Equity at Dec. 31, 2017           30,163
Increase (Decrease) in Temporary Equity [Roll Forward]            
Subscriptions—Redeemable Noncontrolling Interest Holders           500
Distributions to Noncontrolling Interest in Subsidiaries           (1,684)
Balance, end of period, Temporary Equity at Mar. 31, 2018           28,654
Balance, beginning of period at Dec. 31, 2018 857,121 367,252 791,823 (287,337) (14,617)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 54,546   54,546     65
Other Comprehensive Income (Loss), net of tax 7,664       7,664 3,714
Stock Award Activity 7,110 7,110 (11,830) 11,830    
Dividends Declared (27,217)   (27,217)      
Purchase of Treasury Stock (1,485)     (1,485)    
Balance, end of period at Mar. 31, 2019 $ 897,739 $ 374,362 $ 807,322 $ (276,992) $ (6,953)  
Balance, beginning of period, Temporary Equity at Dec. 31, 2018           182,513
Increase (Decrease) in Temporary Equity [Roll Forward]            
Subscriptions—Redeemable Noncontrolling Interest Holders           2,168
Distributions to Noncontrolling Interest in Subsidiaries           (2,260)
Balance, end of period, Temporary Equity at Mar. 31, 2019           $ 186,200