Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
Contract Assets, Current		$ 13,563	$ 36,500
Contract Assets, Non-Current	[1]	0	12,065
Contract Liabilities, Current		2,619	2,988
Contract Liabilities, Non-Current		$ 19,028	$ 19,834

[1] See Revenue Recognition (Note 3) for discussion on the circumstances that result in the recognition of contract assets.