Financial Guarantees and Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Operating activities:
Net cash (used in) provided by operating activities	$ (14,711)	$ 19,614
Investing activities:
Purchases of property, plant and equipment	(14,317)	(13,312)
Proceeds from sale of assets	11	1,657
Acquisition of intangibles and other	(53)	(56)
Intercompany investing activities, net	0	0
Net cash provided by (used in) investing activities	(14,359)	(11,711)
Financing activities:
Proceeds from long-term borrowings	6,666	24
Proceeds from short-term borrowings	1,446	1,441
Repayment of long-term borrowings	(912)	(940)
Repayment of short-term borrowings	(848)	(2,072)
Intercompany financing activities, net	0	0
Net cash provided by (used in) financing activities	6,352	(1,547)
Effect of exchange rate changes on cash	(534)	523
Net change in cash and cash equivalents	(23,252)	6,879
Cash and cash equivalents - beginning of period	97,879	72,742
Cash and cash equivalents - end of period	74,627	79,621
PGI (Issuer)
Operating activities:
Net cash (used in) provided by operating activities	(15,118)	(31,450)
Investing activities:
Purchases of property, plant and equipment	(10,592)	(8,316)
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	(53)	(56)
Intercompany investing activities, net	5,766	15,771
Net cash provided by (used in) investing activities	(4,879)	7,399
Financing activities:
Proceeds from long-term borrowings	0	0
Proceeds from short-term borrowings	1,446	1,436
Repayment of long-term borrowings	(27)	(22)
Repayment of short-term borrowings	(848)	(72)
Intercompany financing activities, net	23,000	25,770
Net cash provided by (used in) financing activities	23,571	27,112
Effect of exchange rate changes on cash	0	0
Net change in cash and cash equivalents	3,574	3,061
Cash and cash equivalents - beginning of period	486	3,135
Cash and cash equivalents - end of period	4,060	6,196
Guarantors
Operating activities:
Net cash (used in) provided by operating activities	16,397	28,014
Investing activities:
Purchases of property, plant and equipment	(682)	(623)
Proceeds from sale of assets	0	1,646
Acquisition of intangibles and other	0	0
Intercompany investing activities, net	(23,000)	(25,770)
Net cash provided by (used in) investing activities	(23,682)	(24,747)
Financing activities:
Proceeds from long-term borrowings	0	0
Proceeds from short-term borrowings	0	0
Repayment of long-term borrowings	0	0
Repayment of short-term borrowings	0	0
Intercompany financing activities, net	(5,766)	(6,990)
Net cash provided by (used in) financing activities	(5,766)	(6,990)
Effect of exchange rate changes on cash	0	0
Net change in cash and cash equivalents	(13,051)	(3,723)
Cash and cash equivalents - beginning of period	28,285	14,574
Cash and cash equivalents - end of period	15,234	10,851
Non-Guarantors
Operating activities:
Net cash (used in) provided by operating activities	(15,990)	23,050
Investing activities:
Purchases of property, plant and equipment	(3,043)	(4,373)
Proceeds from sale of assets	11	11
Acquisition of intangibles and other	0	0
Intercompany investing activities, net	0	(8,781)
Net cash provided by (used in) investing activities	(3,032)	(13,143)
Financing activities:
Proceeds from long-term borrowings	6,666	24
Proceeds from short-term borrowings	0	5
Repayment of long-term borrowings	(885)	(918)
Repayment of short-term borrowings	0	(2,000)
Intercompany financing activities, net	0	0
Net cash provided by (used in) financing activities	5,781	(2,889)
Effect of exchange rate changes on cash	(534)	523
Net change in cash and cash equivalents	(13,775)	7,541
Cash and cash equivalents - beginning of period	69,108	55,033
Cash and cash equivalents - end of period	55,333	62,574
Eliminations
Operating activities:
Net cash (used in) provided by operating activities	0	0
Investing activities:
Purchases of property, plant and equipment	0	0
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	0	0
Intercompany investing activities, net	17,234	18,780
Net cash provided by (used in) investing activities	17,234	18,780
Financing activities:
Proceeds from long-term borrowings	0	0
Proceeds from short-term borrowings	0	0
Repayment of long-term borrowings	0	0
Repayment of short-term borrowings	0	0
Intercompany financing activities, net	(17,234)	(18,780)
Net cash provided by (used in) financing activities	(17,234)	(18,780)
Effect of exchange rate changes on cash	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0