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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) Income, Net of Tax [Member]
Total Shareholders' Equity [Member]
Nonredeemable Noncontrolling Interest in Subsidiary [Member]
Redeemable Noncontrolling Interest in Subsidiaries / Temporary Equity [Member]
Treasury Stock [Member]
Common Class A [Member]
Common Class B [Member]
Common stock, shares outstanding                 24,715,473 9,000 104,789,983
Stock award activity, shares                   0 1,069,081
Stock award activity, treasury shares reissued                 (1,069,081)    
Repurchase of class B shares                     (940,417)
Purchase of treasury stock, shares                 940,417    
Retirement of treasury stock, shares                 (20,000,000)    
Balance at Dec. 31, 2013 $ 566,344 $ 295,958 $ 1,022,608 $ (751,239) $ (1,208) $ 566,119 $ 225 $ 15,517      
Net income 149,213   149,236     149,236 (23) 609      
Other comprehensive income (loss), net of tax (454)       (454) (454)   0      
Subscriptions – redeemable noncontrolling interest holders 0             12,129      
Consolidation/(deconsolidation) 0           0 (12,200)      
Stock award activity 26,308 24,262 (23,548) 25,594   26,308          
Dividends declared (104,834)   (104,834)     (104,834)          
Distributions to noncontrolling interest in subsidiaries (44)           (44) (12,358)      
Purchase of treasury stock (26,881)     (26,881)   (26,881)          
Retirement of treasury stock 0 (49,200) (538,068) 587,268   0          
Balance at Dec. 31, 2014 609,652 271,020 505,394 (165,258) (1,662) 609,494 158 3,697      
Common stock, shares outstanding                 4,586,809 9,000 104,918,647
Stock award activity, shares                   0 871,837
Stock award activity, treasury shares reissued                 (871,837)    
Repurchase of class B shares                     (1,696,457)
Purchase of treasury stock, shares                 1,696,457    
Net income 173,249   169,807     169,807 3,442 (1,263)      
Other comprehensive income (loss), net of tax (2,947)       (2,947) (2,947)   0      
Subscriptions – redeemable noncontrolling interest holders 0             16,409      
Consolidation/(deconsolidation) 0           0 (6,867)      
Stock award activity 29,111 27,559 (24,810) 26,362   29,111          
Dividends declared (104,606)   (104,606)     (104,606)          
Distributions to noncontrolling interest in subsidiaries (2,444)           (2,444) (3,242)      
Purchase of treasury stock (53,043)     (53,043)   (53,043)          
Balance at Dec. 31, 2015 648,972 298,579 545,785 (191,939) (4,609) 647,816 1,156 8,734      
Common stock, shares outstanding                 5,411,429 9,000 104,094,027
Adoption of new accounting pronouncements | Adjustments for New Accounting Pronouncement [Member] 43 123 (911)   831 43   14,850      
Stock award activity, shares                   0 948,860
Stock award activity, treasury shares reissued                 (948,860)    
Repurchase of class B shares                     (3,053,204)
Purchase of treasury stock, shares                 3,053,204    
Net income 218,312   208,919     208,919 9,393 3,202      
Other comprehensive income (loss), net of tax 3,255       3,255 3,255   (13)      
Subscriptions – redeemable noncontrolling interest holders 0             17,868      
Consolidation/(deconsolidation) 0           0 (4,579)      
Stock award activity 23,715 22,280 (18,715) 20,150   23,715          
Dividends declared (205,329)   (205,329)     (205,329)          
Distributions to noncontrolling interest in subsidiaries (9,591)           (9,591) (8,700)      
Purchase of treasury stock (83,593)     (83,593)   (83,593)          
Balance at Dec. 31, 2016 $ 595,784 $ 320,982 $ 529,749 $ (255,382) $ (523) $ 594,826 $ 958 $ 31,362      
Common stock, shares outstanding                 7,515,773 9,000 101,989,683