Income Taxes Operating Loss Carryforwards (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Federal net operating losses resulting from acquisition	$ 38,700
State net operating losses resulting from acquisition	34,400
State net operating losses usable after limitations from Internal Revenue Code 382	25,100
State net operating loss carryforward	1,442	947
Valuation allowance	1,869	758
Foreign net operating loss carryforwards	1,405	861
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	(695)
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	(1,174)
Foreign operating losses available to carryforward	5,741
Foreign operating losses expiring between 2014 and 2016	3,629
Foreign operating losses to be carried forward indefinitely	2,112
Investments in Foreign Subsidiaries and Foreign Corporate Joint Ventures that are Essentially Permanent in Duration [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax liability for foreign subsidiaries' undistributed earnings	$ 115,847