Income Taxes Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 66,284,000	$ 33,719,000	$ 7,902,000
State	12,414,000	19,751,000	6,743,000
Foreign	13,765,000	634,000	1,631,000
Current Income Tax Expense (Benefit)	92,463,000	54,104,000	16,276,000
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	(1,798,000)	11,446,000	18,294,000
State	(267,000)	(4,576,000)	12,317,000
Foreign	(3,998,000)	(2,909,000)	2,584,000
Deferred Income Tax Expense (Benefit)	(6,063,000)	3,961,000	33,195,000
Total current and deferred	86,400,000	58,065,000	49,471,000
Excess Tax Benefit from Share-based Compensation, Financing Activities	363,000	3,423,000	768,000
Effective Income Tax Rate, Continuing Operations	74.30%	41.80%	23.80%
Income Tax Of Equity In Earnings Of Affiliate	$ 19,200,000	$ 27,700,000	$ 32,400,000