Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014
Deferred Income Taxes [Abstract]
Deferred tax assets – current	$ 8,652	$ 8,225
Deferred tax assets – non-current	8,129	6,605
Deferred tax liabilities – current	(420)	(218)
Deferred tax liabilities – non-current	(4,694)	(9,576)
Net deferred tax assets	11,667	5,036
Valuation allowance	$ 3,646	$ 4,350