Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information
Cash and cash equivalents	$ 141,773	$ 142,698	$ 108,501
Restricted cash (included in other assets)	$ 8,923	$ 8,787	$ 15,151
Restricted Cash, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets	Other Assets
Total	$ 150,696	$ 151,485	$ 123,652	$ 97,253
Interest, net of amounts capitalized	271,500	274,700	301,900
Interest capitalized	70,600	53,500	47,300
Capitalized employee expenses related to construction activities	86,100	71,200	53,700
Income taxes, net of refunds	41,700	29,900	20,100
Accrued construction related costs	$ 417,100	$ 423,000	$ 358,700