Derivative Financial Instruments - Table of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Derivative
Fair value, liability	$ (4,254)	$ (2,888)
Fair value, asset	0	1,714
Interest Rate Swap | 0.86%
Derivative
Notional Amount	$ 100,000	$ 100,000
Index	LIBOR	LIBOR
Rate	0.86%	0.86%
Fair value, liability	$ (353)	$ (443)
Interest Rate Swap | 1.39%
Derivative
Notional Amount	$ 50,000	$ 50,000
Index	LIBOR	LIBOR
Rate	1.39%	1.39%
Fair value, liability	$ (622)
Fair value, asset		$ 317
Interest Rate Swap | 1.24%
Derivative
Notional Amount	$ 105,000	$ 105,000
Index	LIBOR	LIBOR
Rate	1.24%	1.24%
Fair value, liability	$ (689)
Fair value, asset		$ 1,397
Interest Rate Swap | 4.98%
Derivative
Notional Amount	$ 26,291	$ 26,874
Index	LIBOR + 1.45%	LIBOR + 1.45%
Rate	4.98%	4.98%
Fair value, liability	$ (2,590)	$ (2,445)
Basis spread on variable rate	1.45%	1.45%