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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2020 shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares
Treasury Stock - Common
Purchase of shares for company benefit plans (in shares)	17,901	14,391	7,550
Release of shares from company benefit plans (in shares)	44,126	4,398	2,519
Preferred stock exchanged for shares of common stock | Preferred stock
Preferred stock conversions/exchanges (in shares)	100	40,000	0
Preferred stock exchanged for shares of common stock | Additional Paid-in Capital
Stock issued, conversion (in shares)	0	51,839	0
Convertible notes exchanged for shares of common stock | Additional Paid-in Capital
Stock issued, conversion (in shares)	0	366,945	0
Senior notes exchanged for shares of common stock | Additional Paid-in Capital
Stock issued, conversion (in shares)	0	1,177,817	0

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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