Business Acquisitions and Divestitures - Intangible Assets Acquired (Details) - USD ($) $ in Thousands			12 Months Ended
	Feb. 23, 2017	Oct. 31, 2016	Dec. 31, 2017
C&CA
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values	$ 10,923
Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values		$ 6,178	$ 10,923
Customer relationships | C&CA
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values	$ 9,556
Acquired finite-lived Intangible Assets, Remaining useful lives	14 years
Customer relationships | Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values			9,556
Non-compete | C&CA
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values	$ 1,232
Acquired finite-lived Intangible Assets, Remaining useful lives	4 years
Non-compete | Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values			1,232
Trademarks | C&CA
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values	$ 135
Acquired finite-lived Intangible Assets, Remaining useful lives	4 years
Trademarks | Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values		$ 163	135
Acquired finite-lived Intangible Assets, Remaining useful lives		4 years
Patents | Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values		$ 114
Acquired finite-lived Intangible Assets, Remaining useful lives		1 year
Software | Lavante
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Fair Values		$ 5,901	$ 0
Acquired finite-lived Intangible Assets, Remaining useful lives		4 years