Leases (Schedule of Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating leases
2019	$ 3,487
2020	4,068
2021	2,033
2022	1,419
2023	1,346
Thereafter	3,047
Total lease payments	15,400
Less imputed interest	(2,283)
Total	13,117
Finance lease
2019	2,057
2020	2,790
2021	2,790
2022	2,838
2023	3,004
Thereafter	15,512
Total lease payments	28,991
Less imputed interest	(9,211)
Total	19,780	$ 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