Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 87,175	$ 87,003
Accumulated Amortization	(25,252)	(23,484)
Net Carrying Amount	61,923	63,519
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,193	4,219
Accumulated Amortization	(2,406)	(2,217)
Net Carrying Amount	1,787	2,002
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	376	373
Accumulated Amortization	(148)	(143)
Net Carrying Amount	228	230
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	36,988	36,843
Accumulated Amortization	(7,200)	(6,582)
Net Carrying Amount	29,788	30,261
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10,029	10,018
Accumulated Amortization	(3,449)	(3,238)
Net Carrying Amount	6,580	6,780
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	35,589	35,550
Accumulated Amortization	(12,049)	(11,304)
Net Carrying Amount	$ 23,540	$ 24,246
Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	15 years
Weighted Average [Member] | Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	5 years	5 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	18 years
Weighted Average [Member] | Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	14 years	14 years
Weighted Average [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years	14 years	14 years