Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 118,149
Tax credit carryforward	3,613
Tax credit carryfoward, Carryfoward period, Minimum (in years)	1
Period over which company has not been in a cumulative loss position	3
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	71,568
Federal [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, Carryforward period, Minimum (in years)	16
Tax loss carryforwards, Carryforward period, Maximum (in years)	19
State [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, Carryforward period, Minimum (in years)	1
Tax loss carryforwards, Carryforward period, Maximum (in years)	19
International [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	45,598
Tax loss carryforwards, Carryforward period, Minimum (in years)	3
Tax loss carryforwards, Carryforward period, Maximum (in years)	15
Windfall tax benefit [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 983