Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and LIabilities (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 156,020	$ 724,595
Receivables, Fair Value Disclosure	1,867,721	1,201,670
Deferred compensation plan assets	32,032	34,549
Long-term debt:
Senior unsecured credit facility	424,019	424,019
Senior unsecured notes	6,175,000	6,175,000
Fair Value
Financial assets:
Cash and cash equivalents	156,020	724,595
Receivables, Fair Value Disclosure	1,926,682	1,213,896
Deferred compensation plan assets	32,032	34,549
Long-term debt:
Senior unsecured credit facility	424,019	424,019
Senior unsecured notes	$ 6,186,270	$ 6,645,574