Fair Value (Details) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Other					$ 200,000	$ 5,800,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure					0	2,800,000
Impairment of Long-Lived Assets to be Disposed of					(200,000)	(3,000,000.0)
Long Lived Assets Held and Used Carrying Amount					6,100,000	800,000
Long Lived Assets Held and Used Fair Value					2,500,000	500,000
Impairment of Long-Lived Assets Held-for-use					(3,600,000)	(300,000)
Long-term fixed-rate debt, fair value					532,200,000		$ 720,300,000
Long-term Fixed-rate Debt, Carrying Value					507,300,000		$ 682,400,000
Benoni [Member]
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale of Properties		$ 1,900,000
Altavista Bearing Plant [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Long Lived Assets Held and Used Carrying Amount				$ 5,600,000
Long Lived Assets Held and Used Fair Value				3,200,000
Impairment of Long-Lived Assets Held-for-use			$ (700,000)	(2,400,000)
Gain (Loss) on Sale of Properties	$ 1,600,000
Land [Member]
Schedule of Equity Method Investments [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Other				200,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure				0
Impairment of Long-Lived Assets to be Disposed of				$ 200,000
Repair Business [Member]
Schedule of Equity Method Investments [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Other						5,800,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure						2,800,000
Impairment of Long-Lived Assets to be Disposed of						(3,000,000.0)
Property, Plant and Equipment [Member]
Schedule of Equity Method Investments [Line Items]
Long Lived Assets Held and Used Carrying Amount						800,000
Long Lived Assets Held and Used Fair Value						500,000
Impairment of Long-Lived Assets Held-for-use						$ 300,000
Property, Plant and Equipment [Member] | Benoni [Member]
Schedule of Equity Method Investments [Line Items]
Long Lived Assets Held and Used Carrying Amount			500,000
Long Lived Assets Held and Used Fair Value			0
Impairment of Long-Lived Assets Held-for-use			500,000
Property, Plant and Equipment [Member] | Altavista Bearing Plant [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Impairment of Long-Lived Assets Held-for-use					$ 3,100,000
Altavista Bearing Plant [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Long Lived Assets Held and Used Fair Value			$ 2,500,000