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Commitments and Contingencies (Details 3) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 25, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2007 | Oct. 06, 2015 subsidiary | Aug. 29, 2015 subsidiary
Mustard Lawsuit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  |  |  | 2
Sloan Lawsuit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  |  | 2 |
Litigation | CRNF |  |  |  |  |  |  |  |  |
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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