Consolidated Statement of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Preferred stock	Preference stock	Common Stock	Additional Paid-in Capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock
Balance at Dec. 31, 2016	$ (103,660)	$ 1	$ 483	$ 323,338	$ 148,125	$ 5,107,734	$ (940,133)	$ (4,743,208)
Increase (Decrease) in Stockholders' Equity
Net income	243,528					243,528
Other comprehensive income (loss)	145,193						145,193
Cash dividends
Common ($0.20 per share)	(139,454)					(139,454)
Preference	(36)					(36)
Issuances of common stock	(1,978)				(33,316)			31,338
Conversions to common stock	0		(42)		(831)			873
Stock-based compensation	24,389				24,389
Balance at Dec. 31, 2017	30,553	1	441	323,338	138,367	5,074,343	(794,940)	(4,710,997)
Increase (Decrease) in Stockholders' Equity
Cumulative effect of accounting changes							(116,233)
Net income	241,811					241,811
Other comprehensive income (loss)	(37,788)						(37,788)
Cash dividends
Common ($0.20 per share)	(140,466)					(140,466)
Preference	(32)					(32)
Issuances of common stock	(1,071)				(37,030)			35,959
Conversions to common stock			(45)		(904)			949
Stock-based compensation	21,042				21,042
Balance at Dec. 31, 2018	101,842	1	396	323,338	121,475	5,279,682	(948,961)	(4,674,089)
Increase (Decrease) in Stockholders' Equity
Net income	194,609					194,609
Other comprehensive income (loss)	108,818						108,818
Cash dividends
Common ($0.20 per share)	(35,353)					(35,353)
Preference	(8)					(8)
Issuances of common stock	(1,684)				(43,062)			41,378
Conversions to common stock	0		(130)		(2,804)			2,934
Redemption of preferred/preference stock	(277)	(1)	(266)		(10)
Stock-based compensation	23,149				23,149
Repurchase of common stock	(105,000)							(105,000)
Balance at Dec. 31, 2019	$ 286,096	$ 0	$ 0	$ 323,338	$ 98,748	$ 5,438,930	$ (840,143)	$ (4,734,777)