Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 17,108	$ 14,786
Short-term finance receivables allowance	12,570	12,187
Long-term finance receivables allowance	$ 8,070	$ 6,446
Preferred stock par value (in dollars per share)	$ 50	$ 50
Preferred stock dividend rate	4.00%	4.00%
Preference stock, par value (in dollars per share)	$ 0	$ 0
Preference stock dividend rate (in dollars per share)	2.12	2.12
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)	135,722,534	136,734,174

The amount per share used to calculated dividend payments on preference stock.

No definition available.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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-Publisher FASB
-Name Accounting Standards Codification
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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

+ References

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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