Derivative Instruments - Schedule of Derivative Financial Instruments at Fair Value (Details) (Designated as Hedging Instrument [Member], Interest rate swap, Accounts payable and accrued expenses, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Designated as Hedging Instrument [Member] | Interest rate swap | Accounts payable and accrued expenses
Derivatives, Fair Value [Line Items]
Pay-fixed swaps	$ 7,462	$ 11,706