FAIR VALUE AND MARKETABLE SECURITIES, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended												9 Months Ended
	Sep. 29, 2012		Jun. 30, 2012		Mar. 31, 2012		Oct. 01, 2011		Jul. 02, 2011		Apr. 02, 2011		Sep. 29, 2012		Oct. 01, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period					$ 1,843						$ 6,004		$ 1,843		$ 6,004
Total gains or losses realized/unrealized [Abstract]
Included in earnings (loss)	0		0		1,250		9		31		62
Included in other comprehensive income(loss)	0		108		343		(283)		457		159
Purchases, redemptions, and settlements:
Purchases													0		0
Redemptions	0		0		(2,013)		0		0		(100)
Settlements													0		0
Transfers in and/or out of Level 3							0		(4,267)		0		0
Balance, end of period	1,531						2,072						1,531		2,072
Amount of total gains or losses for the period included in earnings(loss) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date													0
Securities held:
Face value	3,125												3,125
Minimum [Member]
Securities held:
Discount rate used in valuations (in hundredths)													47.00%
Discount from secondary markets used in valuations (in hundredths)													20.00%
Maximum [Member]
Securities held:
Discount rate used in valuations (in hundredths)													86.00%
Discount from secondary markets used in valuations (in hundredths)													47.00%
Weighted Average [Member]
Securities held:
Weighted average interest rate (in hundredths)													1.90%	[1]
Corporate Debt Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period					1,215	[2]					1,199	[3]	1,215	[2]	1,199	[3]
Total gains or losses realized/unrealized [Abstract]
Included in earnings (loss)	0	[2]	0	[2]	1,250	[2]	9	[3]	9	[3]	9	[3]
Included in other comprehensive income(loss)	0	[2]	0	[2]	(452)	[2]	(188)	[3]	187	[3]	84	[3]
Purchases, redemptions, and settlements:
Purchases													0	[2]	0	[3]
Redemptions	0	[2]	0	[2]	(2,013)	[2]	0	[3]	0	[3]	0	[3]
Settlements													0	[2]	0	[3]
Transfers in and/or out of Level 3							0	[3]	0	[3]	0	[3]	0	[2]
Balance, end of period	0	[2]					1,309	[3]					0	[2]	1,309	[3]
Amount of total gains or losses for the period included in earnings(loss) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date													0	[2]
Securities held:
Face value	0	[2]											0	[2]
Face value of securities redeemed													2,500
Preferred Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period					628	[4]					3,110	[5]	628	[4]	3,110	[5]
Total gains or losses realized/unrealized [Abstract]
Included in earnings (loss)	0	[4]	0	[4]	0	[4]	0	[5]	0	[5]	0	[5]
Included in other comprehensive income(loss)	0	[4]	108	[4]	795	[4]	(95)	[5]	216	[5]	97	[5]
Purchases, redemptions, and settlements:
Purchases													0	[4]	0	[5]
Redemptions	0	[4]	0	[4]	0	[4]	0	[5]	0	[5]	0	[5]
Settlements													0	[4]	0	[5]
Transfers in and/or out of Level 3							0	[5]	(2,565)	[5]	0	[5]	0	[4]
Balance, end of period	1,531	[4]					763	[5]					1,531	[4]	763	[5]
Amount of total gains or losses for the period included in earnings(loss) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date													0	[4]
Securities held:
Face value	3,125	[4]											3,125	[4]
Asset coverage requirement for asset backing to par value of preferred stock issued (in hundredths)	200.00%												200.00%
Preferred Equity Securities [Member] | Minimum [Member]
Securities held:
Financial ratings													NR	[4]
Preferred Equity Securities [Member] | Maximum [Member]
Securities held:
Financial ratings													A2	[4]
Preferred Equity Securities [Member] | Weighted Average [Member]
Securities held:
Weighted average interest rate (in hundredths)													1.90%	[1],[4]
State and Municipal Debt Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period											1,695	[6]			1,695	[6]
Total gains or losses realized/unrealized [Abstract]
Included in earnings (loss)							0	[6]	22	[6]	53	[6]
Included in other comprehensive income(loss)							0	[6]	54	[6]	(22)	[6]
Purchases, redemptions, and settlements:
Purchases															0	[6]
Redemptions							0	[6]	0	[6]	(100)	[6]
Settlements															0	[6]
Transfers in and/or out of Level 3							0	[6]	(1,702)	[6]	0	[6]
Balance, end of period							$ 0	[6]							$ 0	[6]

[1] The interest rate is based on a premium to one month LIBOR.

[2] Security issued by a publicly-held insurance company trust, which holds investments in U.S. Government obligations, highly rated commercial paper and money market funds and other investments approved by two credit rating agencies. The $2,500 face value security was redeemed by the issuer at a discount in the first quarter of 2012 for $2,013, resulting in a gain over its amortized cost basis of $1,250.

[3] Security issued by a publicly-held insurance company trust, which holds investments in U.S. Government obligations, highly rated commercial paper and money market funds and other investments approved by two credit rating agencies. The trust is funded by life insurance residuals.

[4] Preferred securities issued by subsidiaries of two publicly-held debt default insurers. For one security, the DCF model uses a 5% discount rate and the MC method observed secondary markets for similar securities trading at a 25% discount to face value. For the second security, the DCF model discount rate and the secondary market discount were 47% and 86%, respectively. On a weighted average basis, the DCF discount rate and the secondary market discount were 20% and 47%, respectively.

[5] Preferred securities issued by i) a diversified closed-end management investment company and ii) subsidiaries of two publicly-held debt default insurers. The investment company is governed by the Investment Company Act of 1940 with regard to operating standards, antifraud rules, diversification requirements and an asset coverage requirement for asset backing of 200% of the par value of the preferred stock issued. In the second quarter of 2011, the Company transferred its closed-end preferred security from Level 3 to Level 2 after having assessed external valuations and observing sustained trading in similar securities.

[6] Security represents an interest in pooled student loans that are guaranteed by the Federal Family Education Loan Program. In the second quarter of 2011, the Company transferred its state and municipal debt security from Level 3 to Level 2 after having assessed external valuations and observing sustained trading in similar securities.