Income Taxes - 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
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,819	$ 5,646	$ 7,202	$ 18,549
Effective tax rate	11.80%	26.00%	11.00%	28.60%
Discrete item	$ 3,488		$ 7,169
Uncertain tax position			3,153
Uncertain tax position, interest amount, tax expense (benefit)			1,433
Unrecognized tax benefits	1,452		1,452		$ 3,087
Interest expense	0	$ 50
Accrued interest and penalties	$ 240		$ 240		$ 1,553