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SUBSEQUENT EVENTS (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Restricted stock grants | Dec. 31, 2011 Restricted stock grants | Dec. 31, 2010 Restricted stock grants | Jan. 15, 2013 Subsequent event Restricted stock grants | Mar. 13, 2013 Subsequent event Estimate
Subsequent Event |  |  |  |  |  |  |  |
Restricted share grants |  |  |  | 109,450 | 74,040 | 875 | 112,650 |
Aggregate value of restricted shares granted |  |  |  |  |  |  | $ 2,432,000 |
Quarterly cash dividend declared (in dollars per share) | $ 1.34 | $ 1.32 | $ 1.23 |  |  |  |  | $ 0.35
Quarterly cash dividend declared | $ 19,924,000 | $ 19,088,000 | $ 14,123,000 |  |  |  |  | $ 5,312,000

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