Derivatives - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jan. 31, 2015 USD ($) Counterparty
Derivatives Fair Value [Line Items]
Unrealized fair market value gain (loss)		$ 1,425,000
Unrealized gain on derivatives, net of tax	$ 2,861,000	1,069,000
Unrealized gain on derivatives, tax expense	904,000	904,000
Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative notional amount	109,143,000	109,143,000	$ 109,100,000
Number of counterparties | Counterparty			4
Unrealized fair market value gain (loss)		2,300,000
Unrealized gain on derivatives, net of tax	2,900,000	1,100,000
Unrealized gain on derivatives, tax expense	$ 900,000	900,000
Undesignated derivative instruments recorded by the Company		$ 0