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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Treasury Stock - Common |  |  |
Purchase of shares for company benefit plans (in shares) | 2,878,234 | 1,510,022 | 1,206,419
Release of shares from company benefit plans (in shares) | 879,795 | 503,863 | 186,529
Preferred stock exchanged for shares of common stock | Preferred stock |  |  |
Preferred stock conversions/exchanges (in shares) | 40,000 | 0 | 236,048
Preferred stock exchanged for shares of common stock | Additional Paid-in Capital |  |  |
Stock issued, conversion (in shares) | 10,367,950 | 0 | 9,965,835
Convertible notes exchanged for shares of common stock | Additional Paid-in Capital |  |  |
Stock issued, conversion (in shares) | 73,389,094 | 0 | 0
Senior notes exchanged for shares of common stock | Additional Paid-in Capital |  |  |
Stock issued, conversion (in shares) | 235,563,519 | 0 | 0

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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