Segment Reporting (Summary of Revenues and Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenue	$ 59,366	$ 56,886
Long-Lived Assets	144,684		$ 142,161
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenue	58,538	52,960
Long-Lived Assets	100,290		100,404
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	30,739		28,547
FRANCE
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenue	828	$ 3,926
Long-Lived Assets	$ 13,655		$ 13,210