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Business Combinations Hudson (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Borrowings on revolving credit facilities					$ 302,176	$ 3,820
Sales			$ 240,531	$ 203,930	682,839	644,782
Operating Income (Loss)	[1]		10,448	20,064	20,630	55,040
Amortization expense			3,240	$ 2,912	9,301	$ 9,156
Business Combination, Acquisition Related Costs			7,445		8,587
Hudson [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred					419,394
Business Combination, Consideration Transferred, Estimated Working Capital Amount (credit)					5,894
Business Combination, Consideration Transferred, Acquisition-related Tax Benefits (credit)					3,500
Borrowings on revolving credit facilities					300,000
Sales		$ 6,089
Operating Income (Loss)		1,202
Amortization expense		$ 372
Business Combination, Acquisition Related Costs			7,254		8,130
Nonrecurring Acquisition-related Costs Associated with Acquiree [Member] | Hudson [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs			$ 15,917		$ 16,529
[1] Includes restructuring costs of $2,749 and $305 for the three months ended September 30, 2017 and 2016, respectively, and $12,417 and $6,303 for the nine months ended September 30, 2017 and 2016 respectively.

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