Pro Forma Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011 property
Pro Forma Information (Unaudited)
Number of properties owned		22
Purchase price of properties owned		$ 1,132,827
Assumption of mortgage debt	359,213	321,235
Pro forma results of operations
Total revenues		939,422
Income (loss) from continuing operations		87,532
Per share data: Income (loss) from continuing operations, basic (in dollars per share)		$ 0.52
Per share data: Income (loss) from continuing operations, diluted (in dollars per share)		$ 0.52
Revenues		91,139
Operating income		$ 56,339

This element represents the number of properties acquired or agreed to be acquired by the entity during the period.

No definition available.

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- Definition

The net result for the period of deducting operating expenses from operating revenues from real estate properties acquired during the reporting period.

+ References

No definition available.

+ Details

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- Definition

The aggregate revenue from real estate properties acquired during the reporting period.

+ References

No definition available.

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- Definition

This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired or agreed to be acquired by the entity.

+ References

No definition available.

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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- Definition

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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