Consolidated Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Preferred Stock (Par Value: $0.01):	Common Stock (Par Value: $0.01):	Paid-in Capital in Excess of Par:	Retained Earnings:	Treasury Stock, at Cost:	Accumulated Other Comprehensive Loss, Net of Tax:
Balance at beginning of year at Dec. 31, 2017	$ 6,795,376	$ 502,840	$ 4,891	$ 6,072,559	$ 237,868	$ (7,615)	$ (15,167)
Net income	213,906				213,906
Purchase of common stock (150,250 shares)						(2,008)
Other comprehensive loss, net of tax	(56,421)						(53,875)
Dividends paid on common stock ($0.34 per share)					(166,607)
Shares issued for restricted stock awards			13	(8,879)		8,866
Dividends paid on preferred stock ($31.88 per share)	(16,414)				(16,414)
Compensation expense related to restricted stock awards				18,714
Effect of adopting | ASU 2016-01					260
Effect of adopting | ASU 2018-02					2,546		(2,546)
Balance at end of period at Jun. 30, 2018	$ 6,789,352	$ 502,840	$ 4,904	$ 6,082,394	$ 271,559	$ (757)	$ (71,588)