Summary of Significant Accounting Policies (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Sep. 29, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net income (loss)	$ 10,857	$ 4,387	$ 5,129	$ 9,516	$ 20,373	$ 22,867	$ (6,858)	$ 4,988
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization						6,359	5,696	5,476
Amortization of financing fees						2,020	1,653	1,498
Amortization of debt discount						793	381	348
Gain on effective settlement of contract	(15,264)				(15,264)	(15,264)
Pension curtailment expense							1,325
Deferred income taxes						29	39	(271)
Loss (gain) on sale/disposal of fixed assets						205	4	(12)
Amortization of deferred revenue						(127)	(79)	(125)
Common unit compensation expense						27	17
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable						3,484	7,829	(15,761)
Inventories						(19,126)	(4,158)	(4,765)
Prepaid expense and other current assets						(904)	(919)	405
Accounts payable and accrued expense						(4,674)	5,201	8,001
Accrued pension and retirement liabilities						(1,099)	(172)	(622)
Customer advances and deferred income						8,186	2,001	(46)
Other						261	463	(104)
Net cash provided by (used in) operating activities						3,037	12,423	(695)
Investing Activities
Purchase of property and equipment						(8,598)	(4,410)	(5,600)
Proceeds from sale/disposal of property							66	12
Business acquisition, net of cash acquired and reinvested Merger consideration						(59,488)
Change in restricted cash						244	464	(1,380)
Net cash used in investing activities						(67,842)	(3,880)	(6,968)
Financing Activities
Debt issuance costs						(2,120)		(1,636)
Proceeds from the issuance of long-term debt						47,707
Repayment of long-term debt						(1,250)
Line of credit advances						10,083	6
Line of credit repayments						(3,006)
Purchase of common units						(14,000)
Proceeds from the issuance of common units, net of reinvested consideration proceeds						5,000
Capital lease obligation payments						(393)	(1,148)	(1,229)
Distributions paid to members						(6,370)	(3,343)	(12,889)
Net cash provided by (used in) financing activities						35,651	(4,485)	(15,754)
Effect of exchange rates on cash and cash equivalents						(625)	79	209
Change in cash and cash equivalents						(29,779)	4,137	(23,208)
Cash and cash equivalents, beginning of period			42,373	42,373	42,373	42,373	38,236	61,444
Cash and cash equivalents, end of period						12,594	42,373	38,236
As Previously Reported
Operating Activities
Net income (loss)	11,145	4,158	5,070	9,228	20,373	25,734	(7,055)	4,988
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization						6,359	5,696
Amortization of financing fees						2,020	1,653
Amortization of debt discount						793	381
Gain on effective settlement of contract	(15,264)				(15,264)	(15,264)
Pension curtailment expense							1,325
Deferred income taxes						29	39
Loss (gain) on sale/disposal of fixed assets						205	4
Amortization of deferred revenue						(127)	(79)
Common unit compensation expense						27	17
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable						3,222	8,091
Inventories						(19,126)	(4,158)
Prepaid expense and other current assets						(839)	(984)
Accounts payable and accrued expense						(542)	5,201
Accrued pension and retirement liabilities						(1,099)	(172)
Customer advances and deferred income						1,366	2,001
Other						260	463
Net cash provided by (used in) operating activities						3,018	12,423
Investing Activities
Purchase of property and equipment						(8,598)	(4,410)
Proceeds from sale/disposal of property							66
Business acquisition, net of cash acquired and reinvested Merger consideration						(59,488)
Change in restricted cash						244	464
Net cash used in investing activities						(67,842)	(3,880)
Financing Activities
Debt issuance costs						(2,120)
Proceeds from the issuance of long-term debt						47,707
Repayment of long-term debt						(1,250)
Line of credit advances						10,083	6
Line of credit repayments						(3,006)
Purchase of common units						(14,000)
Proceeds from the issuance of common units, net of reinvested consideration proceeds						5,000
Capital lease obligation payments						(393)	(1,148)
Distributions paid to members						(6,370)	(3,343)
Net cash provided by (used in) financing activities						35,651	(4,485)
Effect of exchange rates on cash and cash equivalents						(606)	79
Change in cash and cash equivalents						(29,779)	4,137
Cash and cash equivalents, beginning of period			42,373	42,373	42,373	42,373	38,236
Cash and cash equivalents, end of period						12,594	42,373	38,236
Adjustments
Operating Activities
Net income (loss)	(288)	229	59	288		(2,867)	197
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable						262	(262)
Prepaid expense and other current assets						(65)	65
Accounts payable and accrued expense						(4,132)
Customer advances and deferred income						6,820
Other						1
Net cash provided by (used in) operating activities						19
Financing Activities
Effect of exchange rates on cash and cash equivalents						$ (19)