Derivative Instruments - Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Details) - Cash flow hedging - Designated as hedging instrument - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Derivative
Balance at beginning of period	$ (3,687)	$ (7,462)
Amount of (loss) gain recognized in cumulative other comprehensive loss	(445)	(686)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	1,118	1,227
Unrealized gain on derivative instruments	673	541
Balance at end of period	$ (3,014)	$ (6,921)

Derivative Instruments - Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Details) - Cash flow hedging - Designated as hedging instrument - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2016

Mar. 31, 2015

Derivative

Balance at beginning of period

$ (3,687)

$ (7,462)

Amount of (loss) gain recognized in cumulative other comprehensive loss

(445)

(686)

Amount of loss reclassified from cumulative other comprehensive loss into interest expense

1,118

1,227

Unrealized gain on derivative instruments

673

541

Balance at end of period

$ (3,014)

$ (6,921)