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Subsequent Event
3 Months Ended
Mar. 31, 2013
Subsequent Event [Abstract]  
Subsequent Event
14.   Subsequent Event

Common Stock Dividend

On April 23, 2013, the Company’s Board of Directors approved a second quarter 2013 dividend of $0.275 per common share payable on June 13, 2013 to stockholders of record as of May 9, 2013. The Company estimates the aggregate dividend payment to be $302 million.