Derivative Financial Instruments Derivative Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Interest Rate Swap [Member] March 15, 2013 Interest rate swap [Member]	Jun. 30, 2014 Interest Rate Swap [Member] March 29, 2013 Interest rate swap [Member]
Derivative [Line Items]
Contract date			Mar. 15, 2013	Mar. 29, 2013
Derivative, Notional Amount	$ 143,710	$ 121,930	$ 65,600	$ 65,600
Fixed rate			1.02%	0.97%
Effective date			Apr. 05, 2013	Apr. 05, 2013
Maturity date			Mar. 31, 2019	Mar. 31, 2019