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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events (Unaudited)	21. Subsequent Events (Unaudited) Senior Unsecured Notes Issuance On February 8, 2013, we issued an additional $350 million in aggregate principal amount of 5.75% senior unsecured notes. The notes mature on February 15, 2021. The net proceeds were used to repay borrowings under our credit agreement and general partnership purposes.