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Issuance of Common Stock	9 Months Ended
Issuance of Common Stock	Sep. 30, 2011
Issuance of Common Stock [Abstract]
Issuance of Common Stock	7. Issuance of Common Stock In September 2011, we issued 6,300,000 shares of common stock at a price of $34.00 per share. After underwriting discounts and other offering costs of $10.6 million, the net proceeds of $203.6 million were used to repay borrowings under our acquisition credit facility, which were used to fund recent acquisitions. In March 2011, we issued 8,625,000 shares of common stock at a price of $34.81 per share. After underwriting discounts and other offering costs of $14.6 million, the net proceeds of $285.6 million were used to fund property acquisitions.