Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Taxes [Line Items]
Income tax expense (benefit)	$ 2,185	$ 2,781	$ 3,439	$ 4,133
Effective tax rate	20.70%	24.70%	20.20%	24.50%
Unrecognized tax benefits	$ 3,700		$ 3,700
Unrecognized tax benefits that would impact effective rate	3,200		3,200
Decrease in unrecognized tax benefits is reasonably possible in next 12 months	500		500
Accrued interest and penalties	200		200		$ 200
China
Income Taxes [Line Items]
Income tax refund			800
China | Tax Year 2012 through 2014
Income Taxes [Line Items]
Income tax refund	$ 500		500
China | Tax Year 2013
Income Taxes [Line Items]
Income tax refund			$ 300