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Income Taxes - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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) |  |

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