Other Current and Long-term Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Other current liabilities    
Fair value of swaps $ 51,022,000 $ 109,431,000
Other current liabilities 1,480,000 5,267,000
Total 52,502,000 114,698,000
Deferred fees accrued pursuant to the Bank Agreement included in other current liabilities 700,000 4,900,000
Other long-term liabilities    
Fair value of swaps 2,398,000 59,077,000
Other long-term liabilities 11,310,000 9,103,000
Total $ 13,708,000 $ 68,180,000