Income Taxes (Provision For Income Taxes/(Benefit)) (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]
Current taxes: Federal									$ 43,962	$ 100,262	$ 26,695
Current taxes: State									9,672	21,835	9,954
Current taxes: Foreign									1,329	(1,831)	365
Current taxes: Total									54,963	120,266	37,014
Deferred taxes: Federal									(9,396)	(275)	(20,724)
Deferred taxes: State									3,056	(8,064)	(2,000)
Deferred taxes: Foreign									608	(263)	(1,968)
Deferred Income Tax Expense (Benefit), Total									(5,732)	(8,602)	(24,692)
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