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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, 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 47,944   45,443     45,443 2,501 1,015
Other comprehensive income, net of tax 596       596 596   6
Subscriptions—redeemable noncontrolling interest holders 0             5,431
Stock award activity 7,237 7,237 (11,959) 11,959   7,237    
Dividends declared (25,990)   (25,990)     (25,990)    
Distributions to noncontrolling interest in subsidiaries (2,214)           (2,214) (4,131)
Purchase of treasury stock (13,720)     (13,720)   (13,720)    
Balance at Mar. 31, 2016 662,868 305,939 552,368 (193,700) (3,182) 661,425 1,443 25,905
Balance at Dec. 31, 2016 595,784 320,982 529,749 (255,382) (523) 594,826 958 31,362
Net income 50,117   49,641     49,641 476 910
Other comprehensive income, net of tax 610       610 610   0
Subscriptions—redeemable noncontrolling interest holders 0             2,818
Consolidation/(deconsolidation) 0             (1,891)
Stock award activity 6,648 6,648 (13,702) 13,702   6,648    
Dividends declared (25,466)   (25,466)     (25,466)    
Distributions to noncontrolling interest in subsidiaries (1,434)           (1,434) (3,009)
Purchase of treasury stock (13,569)     (13,569)   (13,569)    
Balance at Mar. 31, 2017 $ 612,690 $ 327,630 $ 540,222 $ (255,249) $ 87 $ 612,690 $ 0 $ 30,190