Summarized Quarterly Results of Operations (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Line Items]
Income tax expense			$ 4,864	$ 7,395	$ 8,037
Impairment charges			544	1,329	0
Loss on extinguishment of debt	$ 1,900		$ (1,888)	0	$ 0
Tax cuts and jobs act of 2017 net benefit to income tax expense	1,200
Material Handling [Member]
Quarterly Financial Information Disclosure [Line Items]
Impairment charges				$ 1,300
Material Handling [Member] | Novel [Member]
Quarterly Financial Information Disclosure [Line Items]
Impairment charges		$ 8,500
Brazil Business [Member]
Quarterly Financial Information Disclosure [Line Items]
Loss on sale of business	35,000
Income tax expense	$ 15,000