Accrued Liabilities an Other Long-term Liabilities Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Long-term Liabilities [Abstract]
Operating lease liabilities, LT	$ 41,019	$ 28,896
Finance Lease, Liability, Noncurrent	2,388	0
Contract liabilities	337	472
Contract with Customer, Liability, Noncurrent	864	94
Benefits	1,183	1,131
Accrued rent	1,462	1,642
Other	582	585
OTHER LONG-TERM LIABILITIES	$ 47,835	$ 32,820