Derivatives - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (3,709)	$ 165	$ (4,473)	$ (5,633)
Recognized interest expense on derivatives into earnings, net of tax	(340)	(120)	(904)	(645)
Derivative assets	300		300		$ 1,600
Derivative liabilities	5,300		5,300
Interest rate swaps
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(3,700)	200	(4,500)	(5,600)
Unrealized gain (loss) on derivatives, tax expense	(2,400)		(2,900)	(3,600)
Recognized interest expense on derivatives into earnings, net of tax	300	$ 100	900	600
Recognized interest expense on derivatives into earnings, tax expense	(200)		(600)	$ 400
Additional amount to be classified as an increase to interest expense during next 12 months	$ 2,100		$ 2,100