Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Employment - related liabilities	$ 12,814	$ 12,129
Liabilities related to discontinued operations	1,155	1,322
Capital loss carryforwards	391	418
Asbestos-related liability	23,702	26,882
Net operating loss - state	1,795	1,616
Other	5,820	6,827
Gross deferred income tax assets	69,235	66,934
Valuation allowance	(2,887)	(3,042)
Deferred Tax Assets, Net, Total	66,348	63,892
Liabilities:
Depreciation	(31,931)	(30,124)
Mark-to-market adjustment - derivatives	(153)	(42)
Other	(2,353)	(1,824)
Gross deferred income tax liabilities	(34,437)	(31,990)
Net deferred income tax assets	31,911	31,902
Domestic Tax Authority [Member]
Assets:
Pension liability	19,574	14,178
Foreign Tax Authority [Member]
Assets:
Pension liability	$ 3,984	$ 3,562