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Debt
6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Debt
Debt
In March 2013, the Company repaid the $600 million of 5.75% notes due March 15, 2013. During the six months ended June 30, 2012, the Company assumed $120 million of debt in the Dyrup acquisition; repaid $117 million of that debt, and repaid $71 million of 6 7/8% notes upon their maturity.