Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Deferred Tax Assets and Liabilities [Abstract]
Post-retirement benefit obligation	$ 17,053	$ 23,297
Expenses currently not deductible	77,888	69,039
Net operating loss carryforward	153,967	142,700
Tax credit carryforward	22,805	4,148
Depreciation and amortization	11,560	10,001
Other	45,131	36,733
Valuation allowance	(148,023)	(155,179)
Deferred tax assets, net	180,381	130,739
Depreciation and amortization	(263,324)	(271,359)
UK and other foreign benefit obligation	(19,514)	(11,317)
Inventory	(11,891)	(12,109)
Outside basis differences and other	(104,886)	(118,974)
Total deferred tax liabilities	(399,615)	(413,759)
Total deferred tax liabilities, net	$ (219,234)	$ (283,020)