Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Statement of Cash Flows [Abstract]
Net Cash Provided by Operating Activities	$ 374,907	$ 273,927
Cash Flows from Investing Activities:
Capital Expenditures	(462,969)	(373,516)
Investment in Contract Receivables	(17,828)	(16,429)
Proceeds from Contract Receivables	10,115	10,494
Investment in Affiliates	(76,495)	(13,155)
Return of Investment in Affiliates	12,138	0
Advances to Affiliates	(30,449)	(26,615)
Divestiture Working Capital Settlement	0	(267)
Investment in Subsidiary, Net of Cash Acquired	(21,034)	(14,683)
Net Cash Used in Investing Activities	(586,522)	(434,171)
Cash Flows from Financing Activities:
Net (Repayments of) Borrowings from Short-Term Credit Facilities	(130,800)	(453,900)
Proceeds from Issuance of Long-Term Debt	400,000	460,000
Principal Repayments of Long-Term Debt	(58,175)	(110,000)
Payments for Issuance of Long-Term Debt	(2,306)	(16,304)
Dividends on Common Stock	(74,362)	(64,460)
Proceeds from Sale of Common Stock	100,380	329,772
Payments for the Issuance of Common Stock	0	(2,318)
Capital Distributions to Noncontrolling Interests in Subsidiaries	(392)	0
Capital Contributions of Noncontrolling Interests in Subsidiaries	1,368	1,072
Net Cash Provided by Financing Activities	235,713	143,862
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	24,098	(16,382)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	29,440	41,831
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 53,538	$ 25,449