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Debt - Revolving Credit Facilities - Narrative (Details) (USD $)
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3 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2015
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Dec. 31, 2014
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| Line of Credit Facility [Line Items] |
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|
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| Amount outstanding |
181,518,000 |
$ 181,518,000 |
$ 12,780,000 |
| Number of properties securing borrowings |
145 |
145 |
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| Weighted Average |
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| Line of Credit Facility [Line Items] |
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|
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| Weighted Average Term |
5 years 3 months 18 days |
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| Weighted Average Effective Interest Rates |
5.33% |
5.33% |
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| Weighted Average Stated Rates |
4.89% |
4.89% |
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| Unsecured Debt |
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|
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| Line of Credit Facility [Line Items] |
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|
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| Line of credit facility maximum borrowing capacity |
600,000,000.0 |
600,000,000.0 |
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| Line of credit facility, accordion feature, increase limit |
1,000,000,000.0 |
1,000,000,000.0 |
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| Maximum borrowing capacity increase, accordion feature |
1,000,000,000.0 |
1,000,000,000.0 |
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| Commitment fee on unused capacity |
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0.15% |
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| Origination costs |
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3,500,000 |
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| Amount outstanding |
170,000,000 |
170,000,000 |
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| Line of credit facility remaining borrowing capacity |
430,000,000 |
430,000,000 |
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| Unsecured Debt | Minimum |
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| Line of Credit Facility [Line Items] |
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|
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| Commitment fee on unused capacity |
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0.125% |
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| Unsecured Debt | Maximum |
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| Line of Credit Facility [Line Items] |
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|
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| Commitment fee on unused capacity |
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0.30% |
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| Unsecured Debt | Weighted Average |
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| Line of Credit Facility [Line Items] |
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| Weighted Average Term |
6 years 9 months 18 days |
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| Weighted Average Effective Interest Rates |
9.12% |
9.12% |
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| Weighted Average Stated Rates |
7.00% |
7.00% |
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| Unsecured Debt | LIBOR |
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| Line of Credit Facility [Line Items] |
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|
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| Basis spread on variable rate |
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1.70% |
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| Unsecured Debt | LIBOR | Minimum |
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| Line of Credit Facility [Line Items] |
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|
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| Basis spread on variable rate |
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0.875% |
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| Unsecured Debt | LIBOR | Maximum |
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| Line of Credit Facility [Line Items] |
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|
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| Basis spread on variable rate |
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1.55% |
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| Line of Credit |
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|
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| Line of Credit Facility [Line Items] |
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|
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| Commitment fee on unused capacity |
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0.35% |
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| Debt extinguishment costs |
|
2,000,000 |
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| Line of Credit | LIBOR |
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|
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| Line of Credit Facility [Line Items] |
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|
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| Basis spread on variable rate |
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2.50% |
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| Revolving Credit Facility |
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|
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| Line of Credit Facility [Line Items] |
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|
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| Line of credit facility maximum borrowing capacity |
400,000,000.0 |
400,000,000.0 |
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| Revolving Credit Facility | Special Purpose Entity |
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| Line of Credit Facility [Line Items] |
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|
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| Line of credit facility maximum borrowing capacity |
40,000,000 |
40,000,000 |
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| Amount outstanding |
15,100,000 |
15,100,000 |
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| Weighted Average Term |
24 months |
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| Number of separate advances |
3 |
3 |
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| Number of properties securing borrowings |
3 |
3 |
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| Weighted Average Effective Interest Rates |
3.89% |
3.89% |
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| Revolving Credit Facility | Weighted Average | Special Purpose Entity |
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|
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| Line of Credit Facility [Line Items] |
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|
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| Weighted Average Stated Rates |
3.58% |
3.58% |
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| Swingline Loans | Unsecured Debt |
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| Line of Credit Facility [Line Items] |
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|
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| Line of credit facility maximum borrowing capacity |
50,000,000.0 |
50,000,000.0 |
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| Letters of Credit | Unsecured Debt |
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| Line of Credit Facility [Line Items] |
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|
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| Line of credit facility maximum borrowing capacity |
60,000,000.0 |
$ 60,000,000.0 |
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