Commitments and Contingencies (Leases Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use asset	$ 13,156		$ 13,156		$ 15,680
Operating lease liabilities	16,921		16,921		$ 19,467
Rental expense for operating leases	$ 3,300	$ 3,200	6,800	$ 6,100
Cash payments for operating leases			4,200	$ 3,200
Loss on termination of lease			$ 400
Minimum
Lessee, Lease, Description [Line Items]
Operating leases term (in years)	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating leases term (in years)	12 years		12 years