Lease Commitments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Lease rental expenses
Rent expense	$ 20,633	$ 21,797	$ 27,307
Future minimum lease payments under non-cancelable operating leases
Operating Leases 2012	21,156
Operating Leases 2013	17,176
Operating Leases 2014	12,109
Operating Leases 2015	10,311
Operating Leases 2016	8,687
Operating Leases Thereafter	13,692
Operating Leases Total lease payments	83,131
Sub-lease Income 2012	(748)
Sub-lease Income 2013	(505)
Sub-lease Income 2014	(475)
Sub-lease Income 2015	(331)
Sub-lease Income 2016	(123)
Sub-lease Income Thereafter	(51)
Sub-lease Income Total lease payments	(2,233)
Net Operating Leases 2012	20,408
Net Operating Leases 2013	16,671
Net Operating Leases 2014	11,634
Net Operating Leases 2015	9,980
Net Operating Leases 2016	8,564
Net Operating Leases Thereafter	13,641
Net Operating Leases Total lease payments	$ 80,898