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STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2018 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Shares issued, beginning balance at Dec. 31, 2017 52,598,005 52,598,005        
Equity, beginning balance at Dec. 31, 2017 $ 1,960,209 $ 526 $ 1,737,551 $ 246,121 $ (18,496) $ (5,493)
Net income 111,254 0 0 111,254 0 0
Other comprehensive income 123 $ 0 0 0   123
Common stock issued, shares   0        
Common stock issued, value (970) $ 0 (14,207) 0 13,237 0
Common stock dividends - $0.92 per share $ (48,272) $ 0 451 (48,723) 0 0
Shares issued, ending balance at Jun. 30, 2018 52,598,005 52,598,005        
Equity, ending balance at Jun. 30, 2018 $ 2,022,344 $ 526 $ 1,723,795 $ 308,652 $ (5,259) $ (5,370)