Derivative Instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 999	$ 1,082
Derivative, Notional Amount	50,000
Interest Rate Swap No. 1 [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	664	881
Derivative, Notional Amount	$ 25,000
Derivative, Fixed Interest Rate	3.75%
Derivative, Maturity Date	Aug. 29, 2024
Interest Rate Swap No. 2 [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 335	$ 201
Derivative, Notional Amount	$ 25,000
Derivative, Fixed Interest Rate	2.98%
Derivative, Maturity Date	Aug. 29, 2019