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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Statutory rate									$ 49,548	$ 101,778	$ 64,831
State income taxes, net of federal income tax									7,908	14,860	11,433
Change in valuation allowance									535	(2,433)	1,659
Provision to return									904	(2,956)	(3,003)
Investment in subsidiary									(4,800)		(58,153)
Change in uncertain tax position									(3,903)	276	(2,956)
Non-taxable book gain											(2,647)
Revaluation of deferred taxes											(2,290)
Other, net									(961)	139	3,448
Provision for income taxes	$ (90)	$ 5,169	$ 17,183	$ 26,969	$ 23,890	$ 25,673	$ 31,946	$ 30,155	$ 49,231	$ 111,664	$ 12,322