Accumulated Other Comprehensive Income Details 1 (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Expense	$ 6,580	$ 6,725
Cost of Goods Sold	165,857	164,666
Income Tax Expense (Benefit)	20,739	19,912
Net Income (Loss) Attributable to Parent	65,674	63,051	$ 352,820
Net Unrealized Gain (Loss) on Cash Flow Hedging Arrangements, Net Of Tax [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Expense	264	765
Cost of Goods Sold	(1,433)	(3,091)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(1,169)	(2,326)
Income Tax Expense (Benefit)	(192)	(339)
Net Income (Loss) Attributable to Parent	(977)	(1,987)
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	3,960	3,441
Income Tax Expense (Benefit)	1,023	918
Net Income (Loss) Attributable to Parent	$ (2,937)	$ (2,523)