CONDENSED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Preferred Stock	Treasury Stock	Additional Paid in Capital	Retained Earnings
Balance at beginning of period at Dec. 31, 2018		$ 533,000	$ 0	$ (38,030,000)	$ 239,827,000	$ 510,282,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock purchase				(1,970,000)
Stock compensation					1,108,000
Dividends paid						(2,606,000)
Other					(527,000)
Net income	$ 110,447,000					110,447,000
Balance at end of period at Mar. 31, 2019	819,064,000	533,000	0	(40,000,000)	240,408,000	618,123,000
Balance at beginning of period at Dec. 31, 2019	765,582,000	533,000	0	(50,576,000)	243,932,000	571,693,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock purchase				0
Stock compensation					1,605,000
Dividends paid						(2,598,000)
Other					(1,012,000)
Net income	21,545,000					21,545,000
Balance at end of period at Mar. 31, 2020	$ 785,122,000	$ 533,000	$ 0	$ (50,576,000)	$ 244,525,000	$ 590,640,000