Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Pension and other benefit programs	$ 65,362	$ 61,074
Foreign operating loss carryforwards	58,333	55,984
Foreign tax credit carryforwards	27,113	30,510
Accrued liabilities	16,335	19,223
Other credit carryforwards	15,373	11,502
Capitalized research costs	8,210	10,278
Inventories	4,460	4,011
State operating loss carryforwards	2,626	2,632
Allowance for doubtful accounts	2,143	3,285
Other	11,623	14,715
Total deferred tax assets	211,578	213,214
Deferred tax liabilities:
Property, equipment and intangibles - depreciation and amortization	35,279	30,507
Unremitted earnings of foreign subsidiaries	1,837	2,051
Convertible debt instruments	553	866
Other	3,228	9,944
Total deferred tax liabilities	40,897	43,368
Net deferred tax assets before valuation allowance	170,681	169,846
Valuation allowance	(37,060)	(26,815)
Net deferred tax assets	$ 133,621	$ 143,031