Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 116,270	$ 113,646
Total acquired intangible assets, Gross Carrying Amount	161,423	158,366
Accumulated Amortization, Finite-lived intangible assets	53,480	47,576
Total acquired intangible assets, Accumulated Amortization	53,480	47,576
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,882	5,808
Accumulated Amortization, Finite-lived intangible assets	2,921	2,427
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	28,020	26,720
Accumulated Amortization, Finite-lived intangible assets	11,523	10,041
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	80,719	78,569
Accumulated Amortization, Finite-lived intangible assets	38,182	33,585
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,649	1,649
Accumulated Amortization, Finite-lived intangible assets	854	623
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	0	900
Accumulated Amortization, Finite-lived intangible assets	$ 0	900
Estimated Life	3 months
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	$ 45,153	44,720
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0
Minimum | Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum | Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	4 years
Maximum | Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	15 years
Maximum | Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	20 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	17 years
Maximum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	10 years