Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Operating Activities
Net income (loss)	$ (12,589)	$ 4,387	$ (20,535)	$ 9,516
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	2,369	1,206	4,649	2,368
Amortization of financing fees	604	414	1,211	828
Amortization of debt discount	308	102	613	206
Deferred income taxes			(119)	15
Other non-cash items			19	(17)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable			6,407	(11,836)
Inventories			(8,856)	(11,148)
Prepaid expenses and other current assets			2,174	(510)
Accounts payable and accrued expenses			801	1,922
Accrued pension and retirement liabilities			(378)	(546)
Customer advances and deferred income			(1,544)	(577)
Other			988	96
Net cash used in operating activities			(14,668)	(9,683)
Investing Activities
Purchases of property and equipment			(1,345)	(3,260)
Change in restricted cash				5
Net cash used in investing activities			(1,345)	(3,255)
Financing Activities
Line of credit advances			13,500	74
Purchase of common units				(14,000)
Distributions paid to members			(683)	(1,357)
Net cash provided by (used in) financing activities			5,109	(15,283)
Effect of exchange rates on cash and cash equivalents			508	(543)
Change in cash and cash equivalents			(10,396)	(28,764)
Cash and cash equivalents, beginning of period			12,594	42,373
Cash and cash equivalents, end of period	2,198	13,609	2,198	13,609
Previously reported
Operating Activities
Net income (loss)		4,158		9,228
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization				2,368
Amortization of financing fees				828
Amortization of debt discount				206
Deferred income taxes				15
Other non-cash items				(17)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable				(11,852)
Inventories				(11,148)
Prepaid expenses and other current assets				(333)
Accounts payable and accrued expenses				2,145
Accrued pension and retirement liabilities				(658)
Customer advances and deferred income				(577)
Other				96
Net cash used in operating activities				(9,699)
Investing Activities
Purchases of property and equipment				(3,260)
Change in restricted cash				5
Net cash used in investing activities				(3,255)
Financing Activities
Line of credit advances				74
Purchase of common units				(14,000)
Distributions paid to members				(1,357)
Net cash provided by (used in) financing activities				(15,283)
Effect of exchange rates on cash and cash equivalents				(527)
Change in cash and cash equivalents				(28,764)
Cash and cash equivalents, beginning of period				42,373
Cash and cash equivalents, end of period		13,609		13,609
Adjustments
Operating Activities
Net income (loss)		229		288
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			(196)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable				16
Prepaid expenses and other current assets				(177)
Accounts payable and accrued expenses				(223)
Accrued pension and retirement liabilities				112
Net cash used in operating activities			(196)	16
Investing Activities
Purchases of property and equipment			196
Net cash used in investing activities			196
Financing Activities
Effect of exchange rates on cash and cash equivalents				$ (16)