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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, 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 $ 505,394 $ (165,258) $ (1,662) $ 609,494 $ 158 $ 3,697
Net income (loss) 79,064   78,066     78,066 998 (383)
Other comprehensive income, net of tax 479       479 479   0
Subscriptions—redeemable noncontrolling interest holders 0             10,539
Stock award activity 15,894 15,812 (12,396) 12,478   15,894    
Dividends declared (52,441)   (52,441)     (52,441)    
Distributions to noncontrolling interest in subsidiaries (134)           (134) (1,630)
Purchase of treasury stock (20,492)     (20,492)   (20,492)    
Balance at Jun. 30, 2015 632,022 286,832 518,623 (173,272) (1,183) 631,000 1,022 12,223
Balance at Dec. 31, 2015 648,972 298,579 545,785 (191,939) (4,609) 647,816 1,156 8,734
Net income (loss) 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             (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)
Purchase 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