Discontinued Operations (Schedule of Major Categories of Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets of Discontinued Operations:
Cash	$ 13,545	$ 4,376
Accounts receivable, net of allowance for doubtful accounts	35,120	28,202
Inventories	12,661	12,614
Property, plant and equipment, net	6,344	6,169
Goodwill and intangibles	39,227	41,024
Other current and noncurrent assets	5,114	5,056
Total assets of discontinued operation	112,011	97,441
Liabilities of Discontinued Operations:
Accounts payable	8,300	8,492
Accrued liabilities	10,883	10,628
Other current liabilities	1,763	383
Liabilities for defined benefit pension plans	9,513	8,152
Other noncurrent liabilities	4,552	4,033
Total liabilities of discontinued operation	$ 35,011	$ 31,688