Balance Sheet Parentheticals (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 01, 2012	Dec. 31, 2011
Assets:
Allowance for doubtful accounts	$ 5,315	$ 5,553
Accumulated depreciation	$ 108,872	$ 106,760
Shareholders' Equity:
Preferred stock, shares authorized	500	500
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	70,000	70,000
Common stock, shares issued	38,075	37,866
Common stock, shares outstanding	38,075	37,866
Common stock, par value	$ 0	$ 0