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Consolidated Statements of Changes in Shareholders' Equity $ in Thousands | USD ($)
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Total shareholders’ equity at beginning of period at Dec. 31, 2015 | $ 2,890,343
Net income | 68,816
Other comprehensive income (loss) | 65,456
Stock option exercises/stock unit conversions (442,054 shares in 2017 and 1,875 shares in 2016) | 97
Stock compensation expense recognized in earnings | 2,482
Purchase of treasury stock (469 shares in 2017) | 0
Cash dividends – preferred stock (approximately $0.34 per share in both 2017 and in 2016) | (2,016)
Cash dividends – common stock ($0.54 per share in 2017 and $0.53 per share in 2016) | (32,938)
Total shareholders’ equity at end of period at Mar. 31, 2016 | 2,992,240
Total shareholders’ equity at beginning of period at Dec. 31, 2016 | 3,002,528
Net income | 84,941
Other comprehensive income (loss) | 18,773
Stock option exercises/stock unit conversions (442,054 shares in 2017 and 1,875 shares in 2016) | 24,747
Stock compensation expense recognized in earnings | 3,103
Purchase of treasury stock (469 shares in 2017) | (42)
Cash dividends – preferred stock (approximately $0.34 per share in both 2017 and in 2016) | (2,016)
Cash dividends – common stock ($0.54 per share in 2017 and $0.53 per share in 2016) | (34,656)
Total shareholders’ equity at end of period at Mar. 31, 2017 | $ 3,097,378

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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