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Debt - Narrative (Details) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 USD ($) acquisition swap Loans | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 05, 2015 USD ($) lender tranche | Nov. 04, 2015 USD ($) | Feb. 03, 2015 USD ($)
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Number of loans in default | Loans |  | 2 |  |  |  |  |
Loans assumed |  | $ 41,717,000 | $ 16,000,000 | $ 0 |  |  |
Number of businesses acquired | acquisition |  | 1 |  |  |  |  |
Long-term line of credit |  |  | 300,000,000 |  |  |  |
Number of interest rate swaps | swap |  | 2 |  |  |  |  |
Mortgages [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Debt default, amount |  |  | 3,151,000 |  |  |  |
The Company [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Recourse debt |  | $ 3,000,000 |  |  |  |  |
IAGM Retail Fund I, LLC [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Recourse debt |  | 23,000,000 |  |  |  |  |
Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
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 [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Long-term line of credit |  | $ 300,000,000 | 300,000,000 |  |  |  |
KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 300,000,000 |  | $ 600,000,000
Basis spread on variable rate |  | 1.40% |  |  |  |  |
Extension option, period |  | 1 year |  |  |  |  |
Commitment fee percentage |  | 0.15% |  |  |  |  |
Remaining borrowing capacity |  | $ 300,000,000 |  |  |  |  |
5-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |
5-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Long-term line of credit |  | $ 50,000,000 | $ 50,000,000 |  |  |  |
5-Year Tranche [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.30% |  |  |  |  |  |
5-Year Tranche [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.30% | 1.30% |  |  |  |
7-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 7 years |  |  |  |  |
7-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Long-term line of credit |  | $ 100,000,000 | $ 100,000,000 |  |  |  |
7-Year Tranche [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |  |  |
7-Year Tranche [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.60% | 1.60% |  |  |  |
Interest Rate Swap [Member] | 5-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Long-term line of credit |  | $ 150,000,000 |  |  |  |  |
Stonecrest Marketplace [Member] | Mortgages [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Debt default, amount |  | 37,866,000 |  |  |  |  |
Bellerive Plaza [Member] | Mortgages [Member] |  |  |  |  |  |  |
Mortgages Payable [Line Items] |  |  |  |  |  |  |
Debt default, amount |  | $ 6,464,000 |  |  |  |  |

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- Definition Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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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