Derivative Financial Instruments Derivative Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Interest Rate Swap [Member] March 15, 2013 Interest rate swap [Member]	Mar. 31, 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	$ 140,737	$ 121,930	$ 67,500	$ 67,500
Fixed rate			1.0165%	0.97%
Effective date			Apr. 05, 2013	Apr. 05, 2013
Maturity date			Mar. 31, 2019	Mar. 31, 2019