Acquisitions, Goodwill And Other Intangible Assets (Narrative) (Details) $ in Thousands	1 Months Ended					3 Months Ended	9 Months Ended
	Oct. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) businessAcquired	Sep. 30, 2020 USD ($)
Business Acquisition [Line Items]
Cash consideration, net of cash acquired							$ 154,544	$ 94,909
Goodwill		$ 568,885		$ 454,728		$ 568,885	568,885
Payment of holdbacks							$ 8,061	$ 9
Exertis | Subsequent Event
Business Acquisition [Line Items]
Asset acquisition, consideration	$ 39,700
Furrion
Business Acquisition [Line Items]
Percentage of interests acquired		100.00%				100.00%	100.00%
Purchase price		$ 146,681
Cash consideration, net of cash acquired		50,534
Consideration, holdback payment liability		31,300
Effective settlement of receivable		34,956
Acquisition related costs						$ 800	$ 2,100
Goodwill		74,574				74,574	74,574
Identifiable intangible assets		95,000				95,000	95,000
Schaudt
Business Acquisition [Line Items]
Percentage of interests acquired			100.00%
Purchase price			$ 29,383
Acquired intangible assets useful life			8 years
Goodwill			$ 16,319
Ranch Hand
Business Acquisition [Line Items]
Percentage of interests acquired			100.00%
Purchase price			$ 59,857
Cash consideration, net of cash acquired			$ 56,857
Acquired intangible assets useful life			13 years
Contingent consideration maximum			$ 3,000
Goodwill			$ 9,634
Other Acquisitions in 2021
Business Acquisition [Line Items]
Cash consideration, net of cash acquired							17,800
Consideration, holdback payment liability							2,100
Contingent consideration maximum		2,000				2,000	$ 2,000
Number of businesses acquired | businessAcquired							2
Consideration, holdback payment liability, term							2 years
Goodwill		8,700				8,700	$ 8,700
Identifiable intangible assets		$ 7,800				$ 7,800	7,800
Payment of holdbacks							500
Veada
Business Acquisition [Line Items]
Percentage of interests acquired				100.00%
Purchase price				$ 69,000
Consideration, holdback payment liability				$ 12,200
Consideration, holdback payment liability, term				2 years
Payment of holdbacks							3,900
Reduction in holdback payment							500
Veada | Other Current Liabilities
Business Acquisition [Line Items]
Consideration, holdback payment liability							6,000
Veada | Other Noncurrent Liabilities
Business Acquisition [Line Items]
Consideration, holdback payment liability							1,800
Challenger
Business Acquisition [Line Items]
Purchase price					$ 35,000
Consideration, holdback payment liability					$ 4,500
Consideration, holdback payment liability, term					2 years
Reduction in holdback payment							1,700
Challenger | Other Current Liabilities
Business Acquisition [Line Items]
Consideration, holdback payment liability							1,800
Challenger | Other Noncurrent Liabilities
Business Acquisition [Line Items]
Consideration, holdback payment liability							$ 1,000