Leases (Schedule of Maturities of Lease Liabilities - Prior Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating leases
2020	$ 5,135
2021	4,202
2022	2,829
2023	1,986
2024	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
2020	2,790
2021	2,838
2022	3,004
2023	3,004
2024	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
2020		5,153
2021		4,133
2022		3,096
2023		2,128
2024		1,496
Thereafter		5,332
Total lease payments		21,338
Less imputed interest		(2,929)
Total operating lease liabilities		18,409
Finance lease
2020		3,347
2021		3,347
2022		3,394
2023		3,560
2024		3,560
Thereafter		15,692
Total lease payments		32,900
Less imputed interest		(8,365)
Finance lease obligation		$ 24,535