Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Deferred employee benefits	$ 83,390	$ 75,026
Inventories	9,410	10,332
Tax loss and credit carryforwards	19,529	9,895
Accrued liabilities and other items	12,491	15,104
Total deferred tax assets	124,820	110,357
Deferred tax liabilities:
Property, plant and equipment	(17,178)	(15,666)
Intangibles	(42,717)	(29,693)
Other items	(2,195)	(3,096)
Total deferred tax liabilities	(62,090)	(48,455)
Net deferred tax assets before valuation allowance	62,730	61,902
Valuation allowance	(11,122)	(4,694)
Net deferred tax assets after valuation allowance	51,608	57,208
Change in valuation allowance	6,400
Pre-tax income (loss) from foreign operations	(4,300)	$ (2,300)	$ (3,000)
Undistributed earnings from foreign subsidiaries	27,500
Distribution Segment Mexico Operations [Member]
Deferred tax assets:
Net deferred tax assets	$ 2,700