Supplemental Cash Flow Information - Non-Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Nov. 15, 2019	Jun. 10, 2014
Non-cash investing activity:
Property and equipment, accrued but unpaid	$ 55	$ 150	$ 50
Right-of-use assets acquired in exchange for operating lease obligations	1,597	4,130	9,850
Purchase of equity investments with common stock	13,500	0	0
Disposition of investment in Consensus	0	112,286	0
Non-cash financing activity:
Conversion shares issued as extinguishment cost to redeem 3.25% Convertible Notes	0	0	431,952
Reacquisition of 3.25% Convertible Notes, net of tax	0	0	390,526
Disposition of investment		160,100
Aggregate purchase price		112,300
Loss on sale on investments		47,800
1.75% Convertible Notes
Non-cash financing activity:
Repayments of Debt	0	112,286	$ 0
1.75% Convertible Notes | Convertible Debt
Non-cash financing activity:
Stated interest rate			1.75%	1.75%
4.625% Senior Notes Due in 2030
Non-cash financing activity:
Repayments of Debt	$ 0	$ 0	$ 485,000
3.25% Convertible Notes | Convertible Debt
Non-cash financing activity:
Stated interest rate					3.25%