Leases Topic 842 Additional Information (Details) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 43,180,000		$ 43,180,000		$ 48,642,000
Operating Lease, Liability	47,791,000		47,791,000		52,894,000
Operating Leases, Rent Expense	1,545,000	$ 1,275,000	4,281,000	$ 3,959,000
Gain (Loss) on Termination of Lease			(700,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 0	$ 0	0	$ 0
Liability [Member]
Operating Leased Assets [Line Items]
Gain (Loss) on Contract Termination			3,600,000
Assets [Member]
Operating Leased Assets [Line Items]
Gain (Loss) on Contract Termination			$ 3,800,000
Accounting Standards Update 2016-02 [Member]
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset					38,500,000
Operating Lease, Liability					$ 41,800,000