Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative, Notional Amount	$ 136,339	$ 119,008
Interest Rate Swap [Member] | March 15, 2013 Interest rate swap [Member]
Derivative [Line Items]
Contract date	Mar. 15, 2013
Derivative, Notional Amount	$ 58,100
Fixed rate	1.02%
Effective date	Apr. 05, 2013
Maturity date	Mar. 31, 2019
Interest Rate Swap [Member] | March 29, 2013 Interest rate swap [Member]
Derivative [Line Items]
Contract date	Mar. 29, 2013
Derivative, Notional Amount	$ 58,100
Fixed rate	0.97%
Effective date	Apr. 05, 2013
Maturity date	Mar. 31, 2019