Accrued Liabilities Long-term liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Liabilities [Abstract]
Operating Lease, Liability, Noncurrent	$ 42,512	$ 28,896
Accrued Employee Benefits	1,064	1,131
Accrued Rent	1,445	1,642
Liabilities for contracts	371	472
Finance Lease, Liability, Noncurrent	2,274	0
Other Accrued Liabilities, Noncurrent	1,084	679
OTHER LONG-TERM LIABILITIES	$ 48,750	$ 32,820