Goodwill and Intangibles (Details Textuals) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Goodwill [Line Items]
Number of Reporting Units		6
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		20.00%
Goodwill and Intangibles (Textuals) [Abstract]
Amortization expense for the remainder of 2018			$ 11,300
Amortization expense for 2019			20,900
Amortization expense for 2020			19,100
Amortization expense for 2021			17,500
Amortization expense for 2022			16,100
Amortization expense for 2023			14,500
Measurement period adjustment impact [Domain]
Goodwill [Line Items]
Amortization	$ 156
Service Center Based Distribution Segment [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments		$ 3,220
Accumulated goodwill impairment losses			64,794
Fluid Power Businesses [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses			$ 36,605
Customer Relationships [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Purchase Accounting Adjustments		2,636
Trade Names [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Purchase Accounting Adjustments		$ 584