Capital Stock - Changes in Outstanding Common Stock (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in Common Stock [Roll Forward]
Outstanding, beginning of year (in shares)	111,452	109,331	107,588
Shares issued for exercise of options (in shares)	0	0	0
Shares issued for time vested restricted stock (net of forfeitures) (in shares)	129	1,918	1,368
Shares issued for employee stock purchase plan (in shares)	88	203	375
Outstanding, end of year (in shares)	111,669	111,452	109,331