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EARNINGS PER SHARE (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Basic:      
Net income available to stockholders $ 63,092 $ 57,442 $ 89,206
Diluted:      
Interest paid on 3.75% convertible bonds 11,203 7,102 5,092
Net income available to stockholders, diluted $ 74,295 $ 64,544 $ 94,298
Basic earnings per share:      
Weighted average number of common shares outstanding 93,277 85,694 89,508
Diluted earnings per share:      
Effect of dilutive share options 58 82 163
Effect of dilutive convertible debt 23,333 22,220 5,753
Weighted average number of diluted common shares outstanding 116,668 107,996 95,424