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Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($)
$ in Thousands
Total
Common stock
Retained earnings
Accumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2014 $ 1,790,573 $ 1,521,297 $ 296,654 $ (27,378)
Balance (in shares) at Dec. 31, 2014   102,565,000    
Increase (decrease) in stockholders' equity        
Net income for common stock 31,866   31,866  
Other comprehensive income, net of taxes 4,058     4,058
Issuance of common stock, net 103,252 $ 103,252    
Issuance of common stock, net (in shares)   4,853,000    
Common stock dividends (31,840)   (31,840)  
Ending Balance at Mar. 31, 2015 1,897,909 $ 1,624,549 296,680 (23,320)
Balance (in shares) at Mar. 31, 2015   107,418,000    
Beginning Balance at Dec. 31, 2015 $ 1,927,640 $ 1,629,136 324,766 (26,262)
Balance (in shares) at Dec. 31, 2015 107,460,406 107,460,000    
Increase (decrease) in stockholders' equity        
Net income for common stock $ 32,352   32,352  
Other comprehensive income, net of taxes 8,800     8,800
Issuance of common stock, net 6,754 $ 6,754    
Issuance of common stock, net (in shares)   416,000    
Common stock dividends (33,367)   (33,367)  
Ending Balance at Mar. 31, 2016 $ 1,942,179 $ 1,635,890 $ 323,751 $ (17,462)
Balance (in shares) at Mar. 31, 2016 107,875,779 107,876,000