Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Details of definite-lived deferred tax assets
Federal net operating loss carryforwards, Deferred Tax Asset	$ 48,496	$ 25,629
Federal net operating loss carryforwards, Valuation Allowance	0
State net operating loss carryforwards, Deferred Tax Asset	36,912	26,663
State net operating loss carryforwards, Valuation Allowance	29,757	20,721
Foreign tax credit carryforwards, Deferred Tax Asset	22,395
Foreign tax credit carryforwards, Valuation Allowance	0
Foreign tax credit carryforwards, Expiration	2019 & 2020
Charitable contribution carryforwards, Deferred Tax Asset	9,523
Charitable contribution carryforwards, Valuation Allowance	$ 0
Charitable contribution carryforwards, Expiration	2013 - 2016
Federal [Member]
Details of definite-lived deferred tax assets
Net operating loss carryforwards, Expiration	2027 - 2031
State and Local Jurisdiction [Member]
Details of definite-lived deferred tax assets
Net operating loss carryforwards, Expiration	2014 - 2031