Pre-Production Costs Related to Long-Term Supply Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Deferred tooling revenue, revenue recognized	$ 5,800	$ 8,200	$ 9,300
Unamortized Preproduction Costs [Abstract]
Preproduction costs	73,095	65,621
Accumulated amortization	(58,632)	(53,408)
Net preproduction costs	14,463	12,213
Deferred Revenue [Abstract]
Accrued expenses	2,908	4,833
Other non-current liabilities	1,266	2,449
Total deferred tooling revenues	$ 4,174	$ 7,282