Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Short-term investments	$ 3,334	$ 18,974
Allowance for doubtful accounts	11,807	18,899
Short-term finance receivables allowance	14,078	18,012
Long-term finance receivables allowance	15,829	17,857
Other assets, fair value	$ 337,577	$ 355,799
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	480,000,000	480,000,000
Common stock, shares issued (in shares)	323,337,912	323,337,912
Treasury stock (in shares)	148,809,481	151,362,724