Income Taxes (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Taxes [Abstract]
Unrecognized tax benefits		$ 1,400	$ 1,400		$ 1,400
Effective tax rate			68.40%	34.40%	57.90%	32.90%
Net non-current deferred tax liability		13,976	$ 13,976		$ 13,976		$ 12,853
Foreign earnings repatriated		4,800
Taxes on foreign earnings repatriated			2,500
Unremitted earnings of foreign subsidiaries		600	600		600
Unrecognized deferred tax liability on unremitted earnings of foreign subsidiaries		100	100		100
Subsequent Event [Member]
Income Taxes [Abstract]
Foreign earnings repatriated	$ 4,800
Domestic Tax Authority [Member] | IRS [Member]
Income Taxes [Abstract]
Research credits potentially disallowed on 2011 and 2012 U.S. income tax returns		$ 1,600	$ 1,600		$ 1,600