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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [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 $ 0 $ 545,785 $ (191,939) $ (4,609) $ 647,816 $ 1,156  
Balance - Temporary Equity at Dec. 31, 2015                 $ 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 161,030     153,077     153,077 7,953 3,255
Other comprehensive income (loss), net of tax 3,184         3,184 3,184   (13)
Subscriptions—redeemable noncontrolling interest holders                 14,040
Consolidation/(deconsolidation)                 (4,579)
Stock award activity 17,271 17,049 45 (13,160) 13,337   17,271    
Dividends declared (77,630)     (77,630)     (77,630)    
Distributions to noncontrolling interest in subsidiaries (7,876)             (7,876) (6,342)
Purchases of treasury stock (64,101)   0   (64,101)   (64,101)    
Balance at Sep. 30, 2016 680,893 315,751 45 607,161 (242,703) (594) 679,660 1,233  
Balance - Temporary Equity at Sep. 30, 2016                 29,945
Balance at Dec. 31, 2016 595,784 320,982 0 529,749 (255,382) (523) 594,826 958  
Balance - Temporary Equity at Dec. 31, 2016                 31,362
Net income 160,007     159,531     159,531 476 2,920
Other comprehensive income (loss), net of tax 689         689 689   0
Subscriptions—redeemable noncontrolling interest holders                 4,095
Consolidation/(deconsolidation)                 (1,891)
Stock award activity 17,320 17,230 0 (14,131) 14,221   17,320    
Dividends declared (76,248)     (76,248)     (76,248)    
Distributions to noncontrolling interest in subsidiaries (1,434)             (1,434) (7,495)
Purchases of treasury stock (42,321)   0   (42,321)   (42,321)    
Balance at Sep. 30, 2017 $ 653,797 $ 338,212 $ 0 $ 598,901 $ (283,482) $ 166 $ 653,797 $ 0  
Balance - Temporary Equity at Sep. 30, 2017                 $ 28,991