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Consolidated Statements of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
General and administrative expenses, equity-based compensation $ 1,576us-gaap_AllocatedShareBasedCompensationExpense $ 3,488us-gaap_AllocatedShareBasedCompensationExpense $ 3,624us-gaap_AllocatedShareBasedCompensationExpense
Unrealized gains (losses) on derivative instruments $ 4,070us-gaap_UnrealizedGainLossOnDerivatives $ 155us-gaap_UnrealizedGainLossOnDerivatives $ 323us-gaap_UnrealizedGainLossOnDerivatives