Business Combinations (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 708,664,000	$ 679,395,000	$ 681,358,000	$ 664,922,000
Measurement period adjustments	(3,613,000)	$ 0	$ (6,669,000)
2020 Acquisition
Business Acquisition [Line Items]
Gross Aggregate Consideration	77,400,000
Cash Assumed	1,700,000
Business Combination, Consideration Transferred	70,700,000
Business Combination indemnity holdback liability	5,000,000.0
Current Assets	46,100,000
Property, Plant, and Equipment	4,900,000
Goodwill	27,300,000
Other Intangibles	20,600,000
Current Liabilities	21,200,000
Deferred Credits and Other Liabilities	300,000
Measurement period adjustments	$ (3,600,000)