Related Party Transactions (Narrative) (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2022 USD ($) $ / employee	Mar. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Long-term debt, excluding current portion	$ 4,486,565	$ 4,580,087
Employer Healthcare Program Agreement [Member]
Related Party Transaction [Line Items]
Service fee per participating employee per month | $ / employee	3.25
Senior Credit Facilities [Member] | GSO-Managed Funds [Member]
Related Party Transaction [Line Items]
Long-term debt, excluding current portion		$ 191,049