Income Taxes (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 Taxes [Line Items]
Income tax provision	$ 10,852	$ 7,254	$ 10,857	$ 6,510
Tax benefit associated with the settlement of equity awards	100		500
Unrecognized tax benefits	10,200		10,200			$ 10,200
Tax benefits that, if recognized, would affect the effective tax rate	$ 1,900		$ 1,900			$ 1,900
Scenario, Forecast [Member]
Income Taxes [Line Items]
Effective tax rate estimate					37.00%