Commitments and Contingencies (Details 3) - USD ($) $ in Millions |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Feb. 25, 2013 |
Dec. 31, 2007 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
Dec. 31, 2011 |
Dec. 31, 2010 |
Dec. 31, 2009 |
Dec. 31, 2008 |
|
| Commitments and Contingencies | ||||||||||
| Real estate tax expense | $ 1.3 | $ 1.3 | $ 1.4 | |||||||
| Litigation | CRNF | ||||||||||
| Commitments and Contingencies | ||||||||||
| 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 | |||||||||