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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, 2015 $ 648,972 $ 298,579 $ 545,785 $ (191,939) $ (4,609) $ 647,816 $ 1,156 $ 8,734
Adoption of new accounting pronouncements (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2015 43 123 (911)   831 43   14,850
Net income 103,487   98,152     98,152 5,335 1,890
Other comprehensive income, net of tax 1,722       1,722 1,722   3
Subscriptions—redeemable noncontrolling interest holders 0             10,774
Deconsolidation 0           0 (1,372)
Stock award activity 13,049 12,898 (13,186) 13,337   13,049    
Dividends declared (51,984)   (51,984)     (51,984)    
Distributions to noncontrolling interest in subsidiaries (5,168)           (5,168) (5,209)
Purchases of treasury stock (41,014)     (41,014)   (41,014)    
Balance at Jun. 30, 2016 669,107 311,600 577,856 (219,616) (2,056) 667,784 1,323 29,670
Balance at Dec. 31, 2016 595,784 320,982 529,749 (255,382) (523) 594,826 958 31,362
Net income 103,568   103,092     103,092 476 2,118
Other comprehensive income, net of tax 599       599 599   0
Subscriptions—redeemable noncontrolling interest holders 0             3,499
Deconsolidation 0             (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 $ 30,662