Financial Statement Information Finite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Stahlgruber [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 285,255,000
Stahlgruber [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	173,946,000
Stahlgruber [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	77,980,000
Stahlgruber [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	33,329,000
Stahlgruber [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	0
All 2018 Acquisitions excluding Stahlgruber [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	30,025,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	8,870,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	20,779,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	376,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	0
All 2018 Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	315,280,000
All 2018 Acquisitions [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	182,816,000
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	98,759,000
All 2018 Acquisitions [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	33,705,000
All 2018 Acquisitions [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0
All 2017 Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 181,216
All 2017 Acquisitions [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		87,306
All 2017 Acquisitions [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		75,450
All 2017 Acquisitions [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		15,757
All 2017 Acquisitions [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 2,703