Acquisitions (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Feb. 08, 2019	Jan. 14, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Acquisition holdback					$ 4,280	$ 1,549
Goodwill			$ 295,402		295,402		$ 297,146
Transaction costs			$ 495	$ 18	2,326	598
Barefoot [Member]
Business Acquisition [Line Items]
Date of acquisition		Jan. 14, 2019
Locust [Member]
Business Acquisition [Line Items]
Date of acquisition	Feb. 08, 2019
2019 Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price				53,600		53,600
Acquisition holdback						2,000
Payment of acquisition holdback					$ 2,000
Goodwill				11,900		11,900
Accounts receivable				12,100		12,100
Inventory				7,700		7,700
Property and equipment				2,300		2,300
Net sales of acquiree since acquisition date				27,700		45,900
Estimated pre-tax earnings of acquiree since acquisition date				2,300		4,200
Customer relationships [Member] | 2019 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets				23,300		$ 23,300
Useful life						9 years
Non-compete agreements [Member] | 2019 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets				$ 200		$ 200
Useful life						2 years