Leases (Schedule of Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating leases
2021	$ 5,135
2022	4,202
2023	2,829
2024	1,986
2025	1,788
Thereafter	4,587
Total lease payments	20,527
Less imputed interest	(2,505)
Total operating lease liabilities	18,022	$ 18,409
Finance lease
2021	2,790
2022	2,838
2023	3,004
2024	3,004
2025	3,004
Thereafter	9,505
Total lease payments	24,145
Less imputed interest	(6,586)
Finance lease obligation	$ 17,559	24,535
Salt Lake City, Utah
Operating leases
2021		5,153
2022		4,133
2023		3,096
2024		2,128
2025		1,496
Thereafter		5,332
Total lease payments		21,338
Less imputed interest		(2,929)
Total operating lease liabilities		18,409
Finance lease
2021		3,347
2022		3,347
2023		3,394
2024		3,560
2025		3,560
Thereafter		15,692
Total lease payments		32,900
Less imputed interest		(8,365)
Finance lease obligation		$ 24,535