CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income		$ 58,307	$ 189,262
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization		24,332	27,970
Employee stock-based compensation awards		7,096	11,132
Company stock 401(k) match contributions		4,669	5,429
Gain on investment sales		0	(152,867)
Pension expense, net of employer contributions		1,469	742
Change in operating assets and liabilities, net of acquisitions:
Decrease in trade receivables		8,770	22,153
Increase (decrease) in accounts payable		1,489	(34,950)
(Decrease) increase in interest and taxes payable		(61,098)	26,958
Increase (decrease) in deferred revenue		2,921	(533)
Changes in other assets and liabilities, net		11,674	5,084
Net cash flow from operating activities		59,629	100,380
Cash flows from investing activities:
Purchase of property and equipment		(4,946)	(4,911)
Payments for acquisitions of businesses and assets, net of cash acquired		0	(52,799)
Payments for investments		(2,435)	(8,985)
Proceeds from investments		992	152,867
Proceeds from sale of assets		21	52
Net cash flow (used for) provided by investing activities		(6,368)	86,224
Cash flows from financing activities:
Repurchase of common stock		0	(82,394)
Dividends paid		(20,089)	(19,898)
Payments for debt issuance costs		0	(6,448)
Payments for tax withholding related to vested stock-based compensation awards		(9,739)	(8,136)
Net cash flow used for financing activities		(29,828)	(116,876)
Increase in cash and cash equivalents		23,433	69,728
Balance of cash and cash equivalents at beginning of period		693,214	361,036
Balance of cash and cash equivalents at end of period		716,647	430,764
Supplemental cash flow information:
Cash paid for income taxes, net of refunds	[1]	43,704	1,044
Cash paid for interest		$ 73,080	$ 74,240

[1] Includes $44,72 of payments for clean energy tax credits in 2025.