Business Acquisitions (Details textual) - USD ($) $ in Thousands								12 Months Ended		24 Months Ended
	May 01, 2019	Mar. 04, 2019	Jan. 28, 2019	Oct. 16, 2018	Sep. 10, 2018	Apr. 03, 2018	Mar. 26, 2018	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2021
Business Acquisition [Line Items]
Goodwill, Acquired During Period								$ 469,446	$ 9,228
Identifiable intangible assets								159,700	$ 6,000
Fishidy [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period								4,600
Identifiable intangible assets								3,800
Total purchase price						$ 7,100
Fishing Hot Spots [Member]
Business Acquisition [Line Items]
Total purchase price							$ 7,100
Fishing Hot Spot [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period								4,700
Identifiable intangible assets								2,200
Acyclica [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period					$ 7,000
Identifiable intangible assets					2,700
Total purchase price					$ 9,700
SeaPilot [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period				$ 3,000
Identifiable intangible assets				1,700
Total purchase price				$ 4,700
Aeryon Lab [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period			$ 161,518
Net tangible assets								6,097
Identifiable intangible assets			44,292
Total purchase price			205,900					205,922
Aeryon [Member]
Business Acquisition [Line Items]
Identifiable intangible assets			$ 44,292
Endeavor [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period		$ 283,983
Net tangible assets								14,915
Identifiable intangible assets		102,740
Total purchase price		$ 385,900						385,931
NEOS [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 13,987
Net tangible assets								1,479
Identifiable intangible assets	6,400
Total purchase price	$ 21,900							$ 21,881
Subsequent Event [Member] | NEOS [Member]
Business Acquisition [Line Items]
Total purchase price										$ 12,000