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Debt - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) Loans | Dec. 31, 2017 USD ($) Properties | Mar. 31, 2018 Properties | Mar. 31, 2018 | Nov. 05, 2015 USD ($) lender tranche | Nov. 04, 2015 USD ($) | Feb. 03, 2015 USD ($) | Feb. 02, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of retail properties |  | 15 | 14 | 2 |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 600,000,000 | $ 300,000,000 |  |
Number of lenders | lender |  |  |  |  | 7 |  |  |
Number of tranches in loan credit facility | tranche |  |  |  |  | 2 |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument term | 5 years |  |  |  |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | $ 150,000,000 |  |  |  |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | One-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable interest rate (percent) | 1.30% |  |  |  |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument term | 7 years |  |  |  |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche | One-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable interest rate (percent) | 1.60% |  |  |  |  |  |  |
The Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Recourse debt | $ 3,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | 300,000,000 | $ 300,000,000 |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | $ 50,000,000 | $ 50,000,000 |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | One-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable interest rate (percent) | 1.30% | 1.30% |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche | One-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable interest rate (percent) | 1.60% | 1.60% |  |  |  |  |  |
Revolving Credit Facility | KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 600,000,000 | $ 300,000,000
Basis spread on variable interest rate (percent) | 1.40% |  |  |  |  |  |  |
Extension option on line of credit, period | 1 year |  |  |  |  |  |  |
Commitment fee | 0.15% |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 300,000,000 |  |  |  |  |  |  |
Bellerive Plaza |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of mortgage loans on real estate in default | Loans | 1 |  |  |  |  |  |  |
Non-recourse debt | $ 6,617,000 |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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