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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Exercise of stock options | 61,949 | 340,684 | 361,618
Common stock shares issued for cash |  | 266,410 | 576,002
Common stock shares issued for purchase of assets |  |  | 163,137
Purchase of treasury stock | 116,483 | 114,295 | 57,619
Common stock dividends/distributions | $ 2.50 | $ 3.84 | $ 3.65
Preferred stock dividend shares | $ 63.80 | $ 63.80 | $ 63.80
Common stock awards | 298,124 | 302,507 | 150,259
Common stock purchase plan | 154,756 | 129,972 | 126,012
Additional Paid-in Capital [Member] |  |  |
Exercise of stock options | 61,949 | 340,684 | 361,618
Common stock shares issued for cash |  | 266,410 | 576,002
Common stock awards | 298,124 | 302,507 | 150,259
Common stock purchase plan | 154,756 | 129,972 | 126,012
Treasury Stock [Member] |  |  |
Purchase of treasury stock | 116,483 | 114,295 | 57,619
Accumulated Deficit [Member] |  |  |
Common stock dividends/distributions | $ 2.50 | $ 3.84 | $ 3.65
Preferred stock dividend shares | $ 63.80 | $ 63.80 | $ 63.80

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