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Long-Term Debt (Details 5) (7.25% senior notes due December 2018, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Nov. 30, 2010
Dec. 31, 2013
Prior to December 1, 2013
Dec. 31, 2013
Twelve month period beginning December 1, 2013
Dec. 31, 2013
Twelve month period beginning December 1, 2014
Dec. 31, 2013
Twelve month period beginning December 1, 2015
Dec. 31, 2013
Beginning December 1, 2016 and thereafter
Long-Term Debt                
Principle amount of senior notes     $ 350.0          
Interest rate (as a percent) 7.25% 7.25% 7.25%          
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed       35.00%        
Redemption price as percentage of principal amount       107.25% 105.438% 103.625% 101.813% 100.00%
Minimum notes remaining outstanding if notes redeemed prior to 2016 (as a percent)       65.00%        
Maximum number of days within which the entity may redeem a percentage of the note following the date of the closing of equity offering       120 days