Derivative Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Nov. 15, 2013
Derivative Instrument [Line Items]
Interest rate swap liability	$ 2,010	$ 1,294
Gain recognized in other comprehensive income (loss)	$ 1,136	$ 1,215
November 2013 Agreement [Member]
Derivative Instrument [Line Items]
Notional amount of interest rate swap			$ 160,000
2013 Term Loan Facility outstanding principal balance			$ 325,000
Fixed rate of derivative			5.384%
Derivative, basis spread on variable rate			3.50%