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Debt (Narrative) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) loan item | Dec. 31, 2017 USD ($) loan
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 5,350,000 |
Number of interest rate cap transactions | item | 3 |
Interest rate cap notional value | $ 150,000,000 |
Weighted average fixed annual rate | 3.80% |
$50.0 Million Term Loan Maturing August 1, 2021, And $100.0 Million Term Loan Maturing January, 1 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 150,000,000 | $ 150,000,000
Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average fixed annual rate | 4.10% |
Senior Unsecured Notes [Member] | July 2024 Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 100,000,000 |
Debt Instrument, Maturity Date | Jul. 01, 2024 |
Senior Unsecured Notes [Member] | September 2022 Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 50,000,000 |
Debt Instrument, Maturity Date | Sep. 01, 2022 |
Senior Unsecured Notes [Member] | July 2026 Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 50,000,000 |
Debt Instrument, Maturity Date | Jul. 01, 2026 |
Senior Unsecured Notes [Member] | October 2027 Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 50,000,000 |
Debt Instrument, Maturity Date | Oct. 01, 2027 |
Mortgage Loans Payable [Member] |  |
Debt Instrument [Line Items] |  |
Number of mortgage loans payable | loan | 3 | 3
Secured loan | $ 64,000,000 | $ 64,800,000
Weighted average fixed annual rate | 4.00% | 4.00%
Total net investment book value of properties securing the debt | $ 154,000,000 | $ 153,700,000
Mortgage Loans Payable [Member] | Minimum [Member[ |  |
Debt Instrument [Line Items] |  |
Mortgage loans maturity, period | 2019 |
Mortgage Loans Payable [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage loans maturity, period | 2021 |
Facility [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, maximum | $ 600,000,000 |
Borrowing Base Properties Percentage | 60.00% |
Effective rate | 1.35% |
LIBOR margin | 1.25% |
Credit facility, amount outstanding | $ 5,400,000 | $ 0
Facility [Member] | August 2020 Unsecured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Aug. 01, 2020 |
Credit facility, current | $ 200,000,000 |
Facility [Member] | August 2021 Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, current | $ 50,000,000 |
Maturity date, line of credit | Aug. 01, 2021 |
Facility [Member] | January 2022 Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, current | $ 100,000,000 |
Maturity date, line of credit | Jan. 01, 2022 |
Facility [Member] | $50.0 Million Term Loan Maturing August 1, 2021, And $100.0 Million Term Loan Maturing January, 1 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Effective rate | 1.30% |
Facility [Member] | Federal Funds Rate [Member] |  |
Debt Instrument [Line Items] |  |
Effective rate | 0.50% |
Facility [Member] | Minimum [Member[ |  |
Debt Instrument [Line Items] |  |
LIBOR margin | 1.35% |
Unused facility fee rate | 0.20% |
Facility [Member] | Minimum [Member[ | $50.0 Million Term Loan Maturing August 1, 2021, And $100.0 Million Term Loan Maturing January, 1 2022 [Member] |  |
Debt Instrument [Line Items] |  |
LIBOR margin | 1.30% |
Facility [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
LIBOR margin | 1.90% |
Unused facility fee rate | 0.25% |
Facility [Member] | Maximum [Member] | $50.0 Million Term Loan Maturing August 1, 2021, And $100.0 Million Term Loan Maturing January, 1 2022 [Member] |  |
Debt Instrument [Line Items] |  |
LIBOR margin | 1.85% |
Interest Rate Cap [Member] |  |
Debt Instrument [Line Items] |  |
Number of interest rate cap transactions | item | 3 |
Interest rate cap notional value | $ 150,000,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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