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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, 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, 2014 $ 609,652 $ 271,020 $ 0 $ 505,394 $ (165,258) $ (1,662) $ 609,494 $ 158 $ 3,697
Net income (loss) 124,105     122,197     122,197 1,908 (1,288)
Other comprehensive income (loss), net of tax (1,883)         (1,883) (1,883)   0
Subscriptions—redeemable noncontrolling interest holders 0               16,209
Consolidation/(deconsolidation) 0             0 (7,105)
Stock award activity 21,236 21,137 5 (12,396) 12,490   21,236    
Dividends declared (78,588)     (78,588)     (78,588)    
Distributions to noncontrolling interest in subsidiaries (133)             (133) (2,902)
Purchase of treasury stock (36,845)   0   (36,845)   (36,845)    
Balance at Sep. 30, 2015 637,544 292,157 5 536,607 (189,613) (3,545) 635,611 1,933 8,611
Balance at Dec. 31, 2015 648,972 298,579 0 545,785 (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 (loss) 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 0               14,040
Consolidation/(deconsolidation) 0               (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)
Purchase 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 $ 29,945