Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 87,003	$ 158,740
Accumulated Amortization	(23,484)	(23,813)
Net Carrying Amount	63,519	134,927
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,219	6,984
Accumulated Amortization	(2,217)	(2,495)
Net Carrying Amount	2,002	4,489
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	373	378
Accumulated Amortization	(143)	(124)
Net Carrying Amount	230	254
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	36,843	94,338
Accumulated Amortization	(6,582)	(8,441)
Net Carrying Amount	30,261	85,897
Supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		350
Accumulated Amortization		(335)
Net Carrying Amount		15
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10,018	14,252
Accumulated Amortization	(3,238)	(3,025)
Net Carrying Amount	6,780	11,227
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	35,550	42,438
Accumulated Amortization	(11,304)	(9,393)
Net Carrying Amount	$ 24,246	$ 33,045
Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	15 years
Weighted Average [Member] | Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	5 years	4 years
Weighted Average [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	10 years	10 years
Weighted Average [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	18 years	16 years
Weighted Average [Member] | Supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years		5 years
Weighted Average [Member] | Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	14 years	13 years
Weighted Average [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	14 years	13 years