Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets:
Accrued expenses and reserves	$ 40,317	$ 62,059
Qualified and nonqualified retirement plans	19,074	36,626
Inventory	17,886	35,565
Accounts Receivable	16,036	19,046
Interest deduction carryforwards	13,845	9,806
Stock-based compensation	4,963	9,687
Net operating loss carryforwards	11,734	7,858
Other	8,971	7,699
Total deferred tax assets, gross	132,826	188,346
Less: valuation allowance	(21,527)	(11,252)
Total deferred tax assets	111,299	177,094
Deferred Tax Liabilities:
Goodwill and other intangible assets	192,688	222,476
Property, plant and equipment	67,467	72,231
Trade name	72,233	59,002
Other	16,165	19,439
Total deferred tax liabilities	348,553	373,148
Net deferred tax liability	$ (237,254)	$ (196,054)