Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 4,213	$ 18,282	$ 28,512	$ 42,968
Income Tax Disclosure [Line Items]
Effective income tax rate	62.40%	22.80%	39.60%	29.30%
Valuation allowance	$ 12,700		$ 12,700			$ 9,900
Unrecognized tax benefits	1,500		1,500			$ 1,300
Unrecognized tax benefits that would impact the Company's effective tax rate	1,300		1,300
Unrecognized tax benefits that would impact goodwill	$ 200		$ 200
Forecast
Income Tax Disclosure [Line Items]
Effective income tax rate					40.00%