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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 36,503   36,307     36,307 196 (85)
Other comprehensive income, net of tax 516       516 516   0
Subscriptions—redeemable noncontrolling interest holders 0             5,785
Stock award activity 9,907 9,825 (12,209) 12,291   9,907    
Dividends declared (26,202)   (26,202)     (26,202)    
Distributions to noncontrolling interest in subsidiaries 0           0 (815)
Purchase of treasury stock (9,948)     (9,948)   (9,948)    
Balance at Mar. 31, 2015 620,428 280,845 503,290 (162,915) (1,146) 620,074 354 8,582
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 pronouncement 0   (831)   831 0   14,850
Net income 47,759   45,258     45,258 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 7,422 7,422 (11,959) 11,959   7,422    
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 $ 662,825 $ 306,001 $ 552,263 $ (193,700) $ (3,182) $ 661,382 $ 1,443 $ 25,905