Organization - Narrative (Details)
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3 Months Ended |
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Mar. 31, 2015
USD ($)
Property
shares
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Mar. 31, 2015
USD ($)
Property
shares
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Dec. 31, 2014
USD ($)
Property
shares
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| Summary Of Business And Significant Accounting Policies [Line Items] |
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| Gross investment in real estate properties |
$ 8,224,762,000
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$ 8,224,762,000
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$ 8,043,497,000
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| Number of real estate properties | Property |
2,547
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2,547
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2,509
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| Number of shares sold (in shares) | shares |
418,401,109
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418,401,109
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411,350,440
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| Revenues |
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$ 200,000
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| Number of properties sold | Property |
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15
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| Gross sales proceeds from sale of real estate |
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$ 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
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$ 265,500,000
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| Number of properties acquired | Property |
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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
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$ 600,000,000.0
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| Maximum borrowing capacity increase, accordion feature |
1,000,000,000.0
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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
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$ 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) | shares |
6,600,000
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6,600,000
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| Aggregate gross proceeds from issuance of common stock |
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$ 79,800,000
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| Aggregate net sales proceeds from Issuance of common stock |
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$ 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 |
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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 |
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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 |
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 |
$ 8,117,359,000
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$ 8,117,359,000
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$ 7,934,072,000
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| Number of real estate properties | Property |
2,402
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2,402
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2,364
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| Gross investment in real estate, percentage |
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98.70%
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| Number of owned real estate properties | Property |
2,402
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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
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$ 107,403,000
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$ 109,425,000
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| Number of real estate properties | Property |
145
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145
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145
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| Securing mortgage properties, percentage |
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1.30%
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| Securing mortgage properties | Property |
145
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145
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