Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Assets:
Cash and cash equivalents	$ 734,553	$ 455,084
Restricted cash	35,641	9,104
Restricted investments	228,959	139,986
Investments in lieu of retainage	186,991	145,124
Total	$ 1,186,144	749,298
Cash and cash equivalents maturity period (maximum)	3 months
Level 1
Assets:
Cash and cash equivalents	$ 734,553	455,084
Restricted cash	35,641	9,104
Restricted investments	0	0
Investments in lieu of retainage	27,849	38,359
Total	798,043	502,547
Level 1 | Money Market Funds
Assets:
Investments in lieu of retainage	27,800	38,400
Level 2
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Restricted investments	228,959	139,986
Investments in lieu of retainage	159,142	106,765
Total	388,101	246,751
Level 2 | Debt Securities
Assets:
Investments in lieu of retainage	159,100	106,800
Level 3
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Restricted investments	0	0
Investments in lieu of retainage	0	0
Total	$ 0	$ 0