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Organization - Narrative (Details) (USD $)
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3 Months Ended |
0 Months Ended |
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Mar. 31, 2015
Property
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Mar. 31, 2015
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Dec. 31, 2014
Property
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Gross investment in real estate properties |
$ 8,226,205,000 |
8,226,205,000 |
$ 8,044,363,000 |
| Number of real estate properties |
2,547 |
2,547 |
2,509 |
| Number of shares sold (in shares) |
418,935,311 |
418,935,311 |
411,824,039 |
| Revenues |
200,000 |
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| Number of properties sold |
15 |
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| Gross sales proceeds from sale of real estate |
77,200,000 |
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| Current Year Acquisitions |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Gross investment in real estate properties |
265,500,000 |
265,500,000 |
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| Number of properties acquired |
53 |
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| Unsecured Debt |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Line of credit facility maximum borrowing capacity |
600,000,000.0 |
600,000,000.0 |
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| Maximum borrowing capacity increase, accordion feature |
1,000,000,000.0 |
1,000,000,000.0 |
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| Revolving Credit Facility |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Line of credit facility maximum borrowing capacity |
400,000,000.0 |
400,000,000.0 |
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| ATM Program |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Number of shares sold (in shares) |
6,600,000 |
6,600,000 |
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| Aggregate gross proceeds from issuance of common stock |
79,800,000 |
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| Aggregate net sales proceeds from Issuance of common stock |
78,600,000 |
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| General Partner |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Percentage ownership of operating partnership |
1.00% |
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| Limited Partner |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Percentage ownership of operating partnership |
99.00% |
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| LIBOR | Unsecured Debt |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Basis spread on variable rate |
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1.70% |
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| Owned Properties |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Gross investment in real estate properties |
8,118,802,000 |
8,118,802,000 |
7,934,938,000 |
| Number of real estate properties |
2,402 |
2,402 |
2,364 |
| Gross investment in real estate, percentage |
98.70% |
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| Number of owned real estate properties |
2,402 |
2,402 |
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| Financed Properties |
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Gross investment in real estate properties |
$ 107,403,000 |
107,403,000 |
$ 109,425,000 |
| Number of real estate properties |
145 |
145 |
145 |
| Securing mortgage properties, percentage |
1.30% |
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| Securing mortgage properties |
145 |
145 |
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