Derivatives - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (543)	$ 421	$ (5,016)	$ (5,212)
Recognized interest expense on derivatives into earnings, net of tax	(138)	(301)	(1,042)	(946)
Derivative assets	400		400		$ 1,600
Derivative liabilities	5,900		5,900
Interest rate swaps
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(500)	400	(5,000)	(5,200)
Unrealized gain (loss) on derivatives, tax expense	(300)	300	(3,200)	(3,300)
Recognized interest expense on derivatives into earnings, net of tax	100	300	1,000	900
Recognized interest expense on derivatives into earnings, tax expense	(100)	$ (200)	(700)	$ (600)
Additional amount to be classified as an increase to interest expense during next 12 months	$ 1,900		$ 1,900