Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Property, plant and equipment	$ (25,999)	$ (26,051)
Goodwill and other intangible assets	896	1,517
Accrued expenses not deductible until paid	595	4,512
Deferred compensation and retiree benefits not deductible until paid	5,039	5,257
Other temporary differences, net	1,291	1,626
Total temporary differences	(18,178)	(13,139)
Federal and state net operating loss carryforwards	2,963	68,758
Valuation allowances	(1,738)	(55,619)
Net deferred tax liability	$ (16,953)	$ 0