Consolidated Statements of Changes in Shareholders' Equity $ in Thousands	USD ($)
Total shareholders’ equity at beginning of period at Dec. 31, 2015	$ 2,890,343
Net income	220,542
Other comprehensive income (loss)	101,650
Stock option exercises/stock unit conversions (774,799 shares in 2017 and 908,921 shares in 2016)	47,873
Stock compensation expense recognized in earnings	7,998
Purchase of treasury stock (1,135,435 shares in 2017)	0
Cash dividends – preferred stock (approximately $1.01 per share in both 2017 and in 2016)	(6,047)
Cash dividends – common stock ($1.68 per share in 2017 and $1.61 per share in 2016)	(100,563)
Total shareholders’ equity at end of period at Sep. 30, 2016	3,161,796
Total shareholders’ equity at beginning of period at Dec. 31, 2016	3,002,528
Net income	263,625
Other comprehensive income (loss)	82,298
Stock option exercises/stock unit conversions (774,799 shares in 2017 and 908,921 shares in 2016)	45,422
Stock compensation expense recognized in earnings	9,013
Purchase of treasury stock (1,135,435 shares in 2017)	(100,042)
Cash dividends – preferred stock (approximately $1.01 per share in both 2017 and in 2016)	(6,047)
Cash dividends – common stock ($1.68 per share in 2017 and $1.61 per share in 2016)	(107,754)
Total shareholders’ equity at end of period at Sep. 30, 2017	$ 3,189,043