Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash dividends declared per share of common stock (in dollars per share)	$ 0.75	$ 1.00
Add’l Paid in Capital
Issuance of common stock through performance stock awards (in shares)	149,000	272,813
Exercise of stock options (in shares)	82,101	14,609
Common stock purchase plan (in shares)	31,824	58,734
Treasury Stock
Purchase of treasury stock (in shares)	65,290	110,520
Accumulated Deficit
Cash dividends declared per share of common stock (in dollars per share)	$ 0.75	$ 1.00
Preferred stock dividend shares (in dollars per share)	$ 15.95	$ 15.95