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Commitments and Contingencies - Property Tax Matter (Details) - Litigation - CRNF - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 25, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2007
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Property tax abatement period |  |  |  |  |  |  | 10 years
Increase in property tax expenses |  | $ 11.3 | $ 11.4 | $ 11.7 | $ 10.7 | $ 10.7 |
Decrease in property tax expenses | $ 10.7 |  |  |  |  |  |
Tax exemption period | 10 years |  |  |  |  |  |

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