Income Taxes - Tax Credit Carryforward Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Aug. 31, 2012	Dec. 31, 2010
Internal Revenue Service (IRS) [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 311
Tax credit carryforwards, decrease		(8)	(2,203)
Tax credit carryforward, expiration date	Jan. 01, 2026
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 1,970