Leases (Schedule of Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases
2019	$ 2,317
2020	4,496
2021	3,304
2022	2,271
2023	1,495
Thereafter	3,054
Total lease payments	16,937
Less imputed interest	(2,446)
Total	14,491
Finance lease
2019	1,371
2020	2,790
2021	2,790
2022	2,838
2023	3,004
Thereafter	15,512
Total lease payments	28,305
Less imputed interest	(8,818)
Total	19,487	$ 25,900
Salt Lake City, Utah [Member]
Finance lease
2019	2,451
2020	2,974
2021	2,990
2022	3,054
2023	3,277
Thereafter	18,930
Total lease payments	33,676
Less imputed interest	(7,790)
Total	$ 25,886