Income Taxes - Tax Credit Carryforwards (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Foreign tax credit [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward		$ 0
Research and development tax credit [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	800	0
Tax credit expiration date	Jan. 01, 2025
Alternative minimum tax credit [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 4,300	$ 0