Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current
Federal									$ 21,040	$ 20,310	$ 15,521
State									4,427	3,896	3,111
Foreign									4,582	3,417	(18)
Deferred
Federal									(574)	3,673	14
State									(358)	1,726	49
Foreign									(1,231)	217	(1,321)
Total income tax provision	818	10,052	11,754	5,263	2,535	10,801	12,773	7,130	27,886	33,239	17,356
Income and loss from continuing operations before income taxes
Domestic									68,961	78,183	49,934
Foreign									9,825	(146)	(18,457)
Income from continuing operations before taxes	$ 5,766	$ 29,432	$ 31,247	$ 12,341	$ (1,964)	$ 29,209	$ 33,832	$ 16,960	$ 78,786	$ 78,037	$ 31,477
Reconciliations between the statutory federal income tax rates and effective income tax rates
Federal tax rate (as a percent)									35.00%	35.00%	35.00%
State taxes, net of federal benefit (as a percent)									3.40%	4.90%	7.00%
Tax benefit of domestic manufacturing deduction (as a percent)									(2.50%)	(2.30%)	(2.90%)
Change in valuation allowance (as a percent)									(0.30%)	3.30%	7.60%
Difference between United States statutory and foreign local tax rates (as a percent)									0.30%	2.00%	7.60%
Change in uncertain tax position (as a percent)									0.00%	(0.70%)	(1.70%)
Other (as a percent)									(0.50%)	0.40%	2.50%
Effective tax rate (as a percent)									35.40%	42.60%	55.10%