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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comp. Income (Loss), net
Balance at Dec. 31, 2016 $ 1,496,696,000 $ 46,359,000 $ 1,083,491,000 $ 381,073,000 $ (14,227,000)
Balance (in shares) at Dec. 31, 2016   46,359,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 2,961,000 $ 149,000 2,812,000    
Exercise of employee common stock options and related tax benefits (in shares)   149,000      
Common dividends paid (7,025,000)     (7,025,000)  
Issuance of restricted common shares, net of forfeitures 0 $ 119,000 (119,000)    
Issuance of restricted common shares, net of forfeitures (in shares)   119,000      
Issuance of common equity, net of costs 192,194,000 $ 3,220,000 188,974,000    
Issuance of common equity, net of costs (in shares)   3,220,000      
Restricted shares withheld for taxes and related tax benefit (3,926,000) $ (57,000) (3,869,000)    
Restricted shares withheld for taxes (in shares)   (57,000)      
Compensation expense for restricted shares 3,474,000   3,474,000    
Net income 39,653,000     39,653,000  
Other comprehensive loss (951,000)       (951,000)
Balance at Mar. 31, 2017 1,723,076,000 $ 49,790,000 1,274,763,000 413,701,000 (15,178,000)
Balance (in shares) at Mar. 31, 2017   49,790,000      
Balance at Dec. 31, 2017 3,707,952,000 $ 77,740,000 3,115,304,000 519,144,000 (4,236,000)
Balance (in shares) at Dec. 31, 2017   77,740,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 1,616,000 $ 87,000 1,529,000    
Exercise of employee common stock options and related tax benefits (in shares)   87,000      
Common dividends paid (10,974,000)     (10,974,000)  
Issuance of restricted common shares, net of forfeitures 0 $ 106,000 (106,000)    
Issuance of restricted common shares, net of forfeitures (in shares)   106,000      
Restricted shares withheld for taxes and related tax benefit (5,265,000) $ (80,000) (5,185,000)    
Restricted shares withheld for taxes (in shares)   (80,000)      
Compensation expense for restricted shares 4,448,000   4,448,000    
Net income 83,510,000     83,510,000  
Other comprehensive loss (31,984,000)       (31,984,000)
Balance at Mar. 31, 2018 $ 3,749,303,000 $ 77,853,000 $ 3,115,990,000 $ 591,680,000 $ (36,220,000)
Balance (in shares) at Mar. 31, 2018   77,853,000