Derivatives - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ 16,171	$ (764)
Recognized interest expense on derivatives into earnings, net of tax	(1,233)	563
Derivative assets	15,900		$ 1,900
Derivative liabilities	800		$ 8,600
Interest rate swaps
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	16,200	(800)
Unrealized gain (loss) on derivatives, tax expense	(5,500)	500
Recognized interest expense on derivatives into earnings, net of tax	1,200	600
Recognized interest expense on derivatives into earnings, tax expense	400	$ (400)
Additional amount to be classified as an increase to interest expense during next 12 months	$ (200)