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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
EARNINGS PER SHARE    
Net income available for stockholders: $ 35,076 $ 80,755
Less: Dividends paid (22,015) (17,571)
Undistributed earnings $ 13,061 $ 63,184
Basic shares outstanding:    
Common stock 211,873 211,079
Restricted shares of common stock 4,321 4,541
Basic shares outstanding, Total 216,194 215,620
Diluted shares outstanding:    
Common stock 211,873 211,079
Dilutive effect of stock based awards 1,331 1,730
Diluted shares outstanding excluding restricted shares of common stock, Total 213,204 212,809
Restricted shares of common stock 4,321 4,541
Diluted shares outstanding, Total 217,525 217,350