Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Other Accrued Liabilities		$ 7,563	$ 3,327
Unrealized Gain (Loss) on Derivatives		498	24,950
Accrued Income Taxes, Current		11,407	26,118
Embedded Derivative, Fair Value of Embedded Derivative Liability		9,269	0
Accrual for Taxes Other than Income Taxes, Current		4,325	3,616
Interest Payable, Current		7,181	1,855
Accrued Salaries, Current		21,473	30,457
Deferred Revenue	[1]	15,991	16,425
Accrued liabilities and other		$ 89,311	$ 119,158

[1] See Note 17 -- Commitments and Contingencies for additional details on deferred revenue liabilities