Leases (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Total equity		$ (702,689)	$ (877,605)	$ (819,865)	$ (608,280)
Term of lease contract			1 year
Lease expense		8,900
Payments to acquire buildings	$ 5,800
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Total equity		$ 1,443			(35)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings, Pre-Tax
Lessee, Lease, Description [Line Items]
Total equity				$ 300	$ 300
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term			1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal lease term			10 years