Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014
Deferred Income Taxes [Abstract]
Deferred tax assets – current	$ 9,587	$ 8,225
Deferred tax assets – non-current	8,927	6,605
Deferred tax liabilities – current	(480)	(218)
Deferred tax liabilities – non-current	(7,666)	(9,576)
Net deferred tax assets	10,368	5,036
Valuation allowance	$ 3,287	$ 4,350