Discontinued Operations Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on dispositions of assets									$ (150)	$ (90)	$ 3,340
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 24,970	$ 3,870	$ 3,300	$ 4,540	$ 1,770	$ 1,740	$ 2,320	$ 3,760	36,680	9,590	(5,000)
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue									182,590	172,110	161,580
Disposal Group, Including Discontinued Operation, Costs of Goods Sold									(138,100)	(128,100)	(131,470)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)									44,490	44,010	30,110
Disposal Group, Including Discontinued Operations, SG&A									(32,920)	(30,590)	(29,240)
Net gain (loss) on dispositions of assets									38,900	(160)	(4,420)
Disposal Group, Including Discontinued Operation, Operating Income (Loss)									50,470	13,260	(3,550)
Disposal Group, Including Discontinued Operation, Interest Expense									0	0	(10)
Disposal Group, Including Discontinued Operations, Other Expense, net									(30)	360	(110)
Disposal Group, Including Discontinued Operations, Nonoperating Expense									(30)	360	(120)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									50,440	13,620	(3,670)
Discontinued Operation, Tax Effect of Discontinued Operation									(13,760)	(4,030)	(1,330)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									$ 36,680	$ 9,590	$ (5,000)