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Senior Notes
 6 Months Ended
Jun. 30, 2011
Senior Notes [Abstract]  
SENIOR NOTES
7. SENIOR NOTES
     In March 2011, the Company issued $300 million aggregate principal amount of 4.75% senior unsecured notes, due April 2018. The notes were offered to investors at a discount to par of 99.315%, resulting in an effective interest rate of 4.86%.