CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 shares	Sep. 30, 2019 shares	Sep. 30, 2020 shares	Sep. 30, 2019 shares
PREFERRED STOCK:
Stock issued, exchanged (in shares)	0	40,000	0	40,000
ADDITIONAL PAID-IN CAPITAL: | Exchange of preferred stock for shares of common stock
Stock issued, exchanged (in shares)	0	51,839	0	51,839
ADDITIONAL PAID-IN CAPITAL: | Exchange of senior notes for shares of common stock
Stock issued, exchanged (in shares)	0	1,177,817	0	1,177,817
ADDITIONAL PAID-IN CAPITAL: | Exchange of convertible senior notes for common stock
Stock issued, exchanged (in shares)	0	366,945	0	366,945
TREASURY STOCK – COMMON:
Purchase of shares for company benefit plans (in shares)	0	267	17,901	13,369
Release of shares from company benefit plans (in shares)	0	187	44,126	1,484
COMMON STOCK: | Exchange of preferred stock for shares of common stock
Stock issued, exchanged (in shares)	0	52,000	0	52,000
COMMON STOCK: | Exchange of senior notes for shares of common stock
Stock issued, exchanged (in shares)	0	1,178,000	0	1,178,000
COMMON STOCK: | Exchange of convertible senior notes for common stock
Stock issued, exchanged (in shares)	0	367,000	0	367,000