Income Taxes Income Taxes (Provision for Income Tax Schedule) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax provision
Federal	$ 94,423	$ 39,517	$ 19,619
State	10,046	2,953	4,993
Foreign	18,952	10,193	4,078
Deferred tax provision (benefit)
Federal	(582)	54,980	55,335
State	(2,045)	4,413	2,393
Foreign	(3,189)	1,209	4,269
Change in valuation allowance	(3)	(6,974)	465
Income Tax Expense (Benefit)	$ 117,602	$ 106,291	$ 91,152