Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Provision for retirement indemnity	$ 2,431	$ 2,170	$ 2,350
Customer allowances	905	0
Unrecognized tax benefits	1,565	291	$ 0
Other	374	65
Total	$ 5,275	$ 2,526