Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Cash dividends declared per share of common stock (in dollars per share)	$ 1.00			$ 0.50
Add’l Paid in Capital
Issuance of common stock through stock awards (in shares)	5,300,000	4,685	149,000		11,008,000	279,116
Exercise of stock options (in shares)	26,880	38,265	82,101	6,455	13,642	14,609
Common stock purchase plan (in shares)	25,347	30,302	31,824	31,705	31,114	58,734
Treasury Stock
Purchase of treasury stock (in shares)	665		65,290		1,196	110,520
Accumulated Deficit
Cash dividends declared per share of common stock (in dollars per share)	$ 1.00	$ 0.75	$ 0.75	$ 0.50	$ 0.50	$ 1.00
Preferred stock dividend shares (in dollars per share)	$ 15.95	$ 15.95	$ 15.95	$ 15.95	$ 15.95	$ 15.95