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Income Taxes (Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]                      
Statutory rate                 $ 49,904 $ 49,548 $ 101,778
State income taxes, net of federal income tax                 7,688 7,908 14,860
Change in valuation allowance                 (229) 535 (2,433)
Provision to return                 (204) 904 (2,956)
Investment in subsidiary                   (4,800)  
Change in uncertain tax position                 41 (3,903) 276
Non-deductible litigation expense                 7,700    
Foreign tax rate difference                 (1,810) (106) 90
Other, net                 (2,028) (855) 49
Provision for income taxes $ 28,014 $ 10,168 $ 6,022 $ 16,858 $ (90) $ 5,169 $ 17,183 $ 26,969 $ 61,062 $ 49,231 $ 111,664