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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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