Income Taxes - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Examination [Line Items]
Equity Method Investment Ownership Percentage Acquired			21.10%
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ (18,021)	$ 0
Deferred income tax expense (benefit)	732	884	(2,544)
Correction of Immaterial Errors [Member]
Income Tax Examination [Line Items]
Increase (Decrease) in Deferred Tax Assets	(10,350)
Valuation Allowance, Deferred Tax Asset, Change in Amount	(10,350)
Review of Realizability of Deferred Tax Assets [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	(6,493)
Deferred income tax expense (benefit)	(6,493)
Review of Realizability of Remaining Deferred Tax Assets [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	(1,178)
Deferred income tax expense (benefit)	$ (1,178)