Leases Topic 842 Additional Information (Details) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 46,881,000		$ 46,881,000		$ 48,642,000
Operating Lease, Liability	51,232,000		51,232,000		52,894,000
Operating Leases, Rent Expense	$ 1,368,000	$ 1,347,000	$ 2,736,000	$ 2,684,000
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