Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit) [Abstract]
Federal, Current	$ 202,095	$ 164,125	$ 136,247
State, Current	27,586	28,669	22,914
Foreign, Current	8,476	8,683	4,448
Current Income Tax Expense (Benefit), Total	238,157	201,477	163,609
Federal, Deferred	14,742	17,343	(936)
State, Deferred	981	(244)	(492)
Foreign, Deferred	(261)	(1,424)	3,103
Deferred Income Tax Expense (Benefit), Total	15,462	15,675	1,675
Federal, Total	216,837	181,468	135,311
State, Total	28,567	28,425	22,422
Foreign, Total	8,215	7,259	7,551
Total income tax expense	$ 253,619	$ 217,152	$ 165,284