Income Taxes - Net Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Deferred Income Taxes [Abstract]
Deferred tax assets - current	$ 9,884	$ 15,114
Deferred tax assets - noncurrent	4,261	1,751
Deferred tax liabilities - current	(53)	(9)
Deferred tax liabilities - noncurrent	(11,465)	(8,931)
Net deferred tax assets (liabilities)	2,627	7,925
Valuation allowance	$ 4,514	$ 2,723