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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 26, 2012	Sep. 28, 2011
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 1,865	$ 988
Interest paid	10,371	17,057
Noncash investing and financing activities:
Notes received in connection with disposition of property	0	500
Issuance of common stock, pursuant to share-based compensation plans	856	1,482
Execution of capital leases	1,581	4,094
Treasury stock payable	$ 231	$ 223

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