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STATEMENT OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2017 - 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, 2016 52,598,005 52,598,005        
Equity, beginning balance at Dec. 31, 2016 $ 1,888,280 $ 526 $ 1,749,574 $ 161,021 $ (18,126) $ (4,715)
Cumulative effect of accounting change 10,982     10,982 0 0
Net income 76,456 0 0 76,456 0 0
Other comprehensive income 129 0 0 0   129
Repurchase of common stock (2,469) $ 0 0 0 (2,469) 0
Common stock issued, shares   0        
Common stock issued, value (6,766) $ 0 (17,469) 0 10,703 0
Common stock dividends - $0.42 per share $ (22,034) $ 0 230 (22,264) 0 0
Shares issued, ending balance at Mar. 31, 2017 52,598,005 52,598,005        
Equity, ending balance at Mar. 31, 2017 $ 1,944,578 $ 526 $ 1,732,335 $ 226,195 $ (9,892) $ (4,586)