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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2013 $ 1,774,383 $ 106,882 $ 1,592 $ 1,608,117 $ 121,870 $ (56,924) $ (7,154)
Comprehensive income 154,971       144,050 10,921  
Dividends declared:              
Preferred stock (8,352)       (8,352)    
Common stock: $0.48/share (81,220)       (81,220)    
Issuance of common stock 5,192   23 14,524 (228)   (9,127)
Issuance of common stock - acquisitions 170,150   139 170,011      
Restricted stock compensation 3,618     3,618      
Tax benefit of stock-based compensation 2,714     2,714      
Balance at Dec. 31, 2014 2,021,456 106,882 1,754 1,798,984 176,120 (46,003) (16,281)
Comprehensive income 154,519       159,649 (5,130)  
Dividends declared:              
Preferred stock (8,041)       (8,041)    
Common stock: $0.48/share (84,511)       (84,511)    
Issuance of common stock 8,270   12 4,737     3,521
Restricted stock compensation 4,461     4,461      
Tax benefit of stock-based compensation 28     28      
Balance at Dec. 31, 2015 2,096,182 106,882 1,766 1,808,210 243,217 (51,133) (12,760)
Comprehensive income 160,655       170,891 (10,236)  
Dividends declared:              
Preferred stock (8,041)       (8,041)    
Common stock: $0.48/share (101,670)       (101,670)    
Issuance of common stock 11,406   19 13,411     (2,024)
Issuance of common stock - acquisitions 404,206   340 403,866      
Restricted stock compensation 7,066     7,066      
Tax benefit of stock-based compensation 1,813     1,813      
Balance at Dec. 31, 2016 $ 2,571,617 $ 106,882 $ 2,125 $ 2,234,366 $ 304,397 $ (61,369) $ (14,784)