Prepaid Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid insurance	$ 2,270	$ 1,339
Prepaid inventories	1,206	1,493
Prepaid income taxes	407	0
Other	2,538	1,301
Prepaid expenses	$ 6,421	$ 4,133