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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive (Loss) Income, net of tax [Member]
Total Shareholders' Equity [Member]
Nonredeemable Noncontrolling Interest in Subsidiary [Member]
Redeemable Noncontrolling Interest in Subsidiaries/Temporary Equity [Member]
Balance at Dec. 31, 2016 $ 595,784 $ 320,982 $ 529,749 $ (255,382) $ (523) $ 594,826 $ 958  
Balance - Temporary Equity at Dec. 31, 2016               $ 31,362
Net Income (Loss) 103,568   103,092     103,092 476 2,118
Other Comprehensive Income (Loss), net of tax 599       599 599   0
Subscriptions—Redeemable Noncontrolling Interest Holders               3,499
Deconsolidation               (1,891)
Stock Award Activity 12,294 12,204 (14,131) 14,221   12,294    
Dividends Declared (50,930)   (50,930)     (50,930)    
Distributions to Noncontrolling Interest in Subsidiaries (1,434)           (1,434) (4,426)
Purchases of Treasury Stock (28,252)     (28,252)   (28,252)    
Balance at Jun. 30, 2017 631,629 333,186 567,780 (269,413) 76 631,629 0  
Balance - Temporary Equity at Jun. 30, 2017               30,662
Balance at Dec. 31, 2017 761,215 343,378 697,359 (278,732) (790) 761,215 0  
Balance - Temporary Equity at Dec. 31, 2017               30,163
Net Income (Loss) 99,153   99,153     99,153 0 (480)
Other Comprehensive Income (Loss), net of tax (445)       (445) (445)   0
Subscriptions—Redeemable Noncontrolling Interest Holders               1,163
Deconsolidation               (1,751)
Stock Award Activity 12,967 12,760 (11,288) 11,495   12,967    
Dividends Declared (52,596)   (52,596)     (52,596)    
Distributions to Noncontrolling Interest in Subsidiaries 0             (8,111)
Purchases of Treasury Stock (21,040)     (21,040)   (21,040)    
Balance at Jun. 30, 2018 799,125 $ 356,138 732,753 $ (288,277) (1,489) 799,125 $ 0  
Balance - Temporary Equity at Jun. 30, 2018               $ 20,984
Adoption of New Accounting Pronouncements | Adjustments for New Accounting Pronouncement [Member] $ (129)   $ 125   $ (254) $ (129)