Debt (Narrative) (Details)	3 Months Ended
Mar. 31, 2019 USD ($) loan derivative	Dec. 31, 2018 USD ($) loan derivative
Debt Instrument [Line Items]
Credit facility, amount outstanding	$ 0	$ 19,000,000
Interest rate cap notional value	$ 150,000,000
Weighted average fixed annual rate	4.00%
Interest rate cap [Member]
Debt Instrument [Line Items]
Interest rate cap notional value	$ 150,000,000
Credit facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding	0	19,000,000
Credit facility, maximum	$ 600,000,000
Unencumbered properties, percent	60.00%
August 2021 term loan [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Credit facility, current	$ 50,000,000
January 2022 term loan [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Credit facility, current	$ 100,000,000
Line of credit [Member] \| Credit facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Line of credit [Member] \| Credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Line of credit [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.05%
Line of credit [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, facility fee, percent	0.15%
Line of credit [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, facility fee, percent	0.30%
Line of credit [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Term loan [Member]
Debt Instrument [Line Items]
Long-term debt	$ 150,000,000	$ 150,000,000
Weighted average fixed annual rate	3.70%
Term loan [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.20%
Term loan [Member] \| Credit facility, Fifth Amended and Restated Senior Credit Agreement [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Term loan [Member] \| Credit facility, previous agreement [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.20%
Senior unsecured notes [Member]
Debt Instrument [Line Items]
Weighted average fixed annual rate	4.10%
Senior unsecured notes [Member] \| September 2022 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 50,000,000
Senior unsecured notes [Member] \| July 2024 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	100,000,000
Senior unsecured notes [Member] \| July 2026 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	50,000,000
Senior unsecured notes [Member] \| October 2027 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	50,000,000
Senior unsecured notes [Member] \| October 2022 unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000
Mortgage loans payable [Member]
Debt Instrument [Line Items]
Number of mortgage loans payable \| loan	2	2
Secured loan	$ 45,400,000	$ 45,800,000
Weighted average fixed annual rate	4.13757%	4.10%
Total net investment book value of properties securing the debt	$ 114,500,000	$ 114,500,000
Cash flow hedging [Member] \| Interest rate cap [Member]
Debt Instrument [Line Items]
Number of interest rate cap transactions \| derivative	3	3

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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- Definition

Investment under secured debt book value net.

+ References

No definition available.

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- Definition

Line of Credit Facility, Unencumbered Properties

+ References

No definition available.

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- Definition

Number of Mortgage Loans

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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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

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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.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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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

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