Fixed charge coverage ratio required to be maintained according to covenants under credit agreement.

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Maximum annual distributions as percentage of adjusted funds from operations permitted under covenants under credit agreement.

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Maximum leverage ratio required to be maintained according to covenants under credit agreement.

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Maximum secured debt leverage ratio required to be maintained according to covenants under credit agreement.

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Minimum tangible net worth required to be maintained according to covenants under credit agreement.

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Line Of Credit Facility Covenant Percentage Of Net Cash Proceeds Of Issuances And Sales Of Equity Interests

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No definition available.

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Number Of Unsecured Credit Agreements

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The period for which the line of credit may be requested to be renewed, provided no event of default has occurred and remains uncured.

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

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

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No definition available.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
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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.

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Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

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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.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The effective interest rate during the reporting period.

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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt (Credit Facilities Narrative) (Details)	3 Months Ended		6 Months Ended	9 Months Ended
Debt (Credit Facilities Narrative) (Details)	Sep. 30, 2017 USD ($) agreement	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) agreement	Sep. 30, 2016 USD ($)	Aug. 12, 2019	Aug. 11, 2019	Aug. 09, 2018	Mar. 23, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revolving Line of Credit [Abstract]
Number of unsecured credit agreements \| agreement	3			3
Debt instrument, face amount	$ 975,000,000			$ 975,000,000
Deferred costs, net of accumulated amortization	2,483,000			2,483,000						$ 1,383,000
Outstanding borrowings on term loans	721,361,000			721,361,000						663,500,000
Line of Credit
Line of credit facility covenant minimum tangible net worth	$ 1,075,000,000			$ 1,075,000,000
Line of credit facility covenant percentage of net cash proceeds of issuance and sales of equity interests (in hundredths)				75.00%
Line of credit facility covenant maximum annual distributions (in hundredths)	95.00%			95.00%
Line of credit facility covenant maximum leverage ratio (in hundredths)	60.00%			60.00%
Interest Rate Swap [Member]
Revolving Line of Credit [Abstract]
Notional amount	$ 150,000,000			$ 150,000,000
Interest Rate Swap: $300,000 Second Term Loan [Member]
Revolving Line of Credit [Abstract]
Debt instrument, face amount									$ 300,000,000
Maturity Date				Aug. 10, 2020
Interest Rate Swap: $200,000 Third Term Loan [Member]
Revolving Line of Credit [Abstract]
Notional amount	$ 50,000,000			$ 50,000,000
Fixed interest payment, percentage	3.894%			3.894%
Maturity Date				Oct. 03, 2019
Scenario, Forecast [Member] \| Interest Rate Swap: $300,000 Second Term Loan [Member]
Revolving Line of Credit [Abstract]
Fixed interest payment, percentage						4.3925%	4.1155%	3.693%
Scenario, Forecast [Member] \| Interest Rate Swap: $300,000 Second Term Loan, Aug 10, 2017 to Aug 9, 2018 [Member]
Revolving Line of Credit [Abstract]
Fixed interest payment, percentage								3.693%
Scenario, Forecast [Member] \| Interest Rate Swap: $300,000 Second Term Loan, Aug 10, 2018 to Aug 11, 2019 [Member]
Revolving Line of Credit [Abstract]
Fixed interest payment, percentage							4.1155%
Scenario, Forecast [Member] \| Interest Rate Swap: $300,000 Second Term Loan, Aug 12, 2019 to Aug 10, 2020 [Member]
Revolving Line of Credit [Abstract]
Fixed interest payment, percentage						4.3925%
Minimum [Member]
Revolving Line of Credit [Abstract]
Line of credit facility covenant fixed charge coverage ratio	1.50			1.50
Maximum [Member]
Revolving Line of Credit [Abstract]
Line of credit facility covenant maximum secured debt leverage ratio (in hundredths)	45.00%			45.00%
$300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member]
Revolving Line of Credit [Abstract]
Debt instrument, face amount	$ 300,000,000			$ 300,000,000
Maturity date				Aug. 10, 2020
$300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member] \| Minimum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				1.50%
$300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member] \| Maximum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				2.25%
$200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member]
Revolving Line of Credit [Abstract]
Debt instrument, face amount	200,000,000			$ 200,000,000
Maturity date				Aug. 02, 2021
$200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member] \| Minimum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				1.45%
$200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member] \| Maximum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				2.20%
$500 Million Senior Unsecured Credit Agreement ("Credit Facility") [Member]
Revolving Line of Credit [Abstract]
Debt instrument, face amount			$ 460,520,000
Revolving line of credit, current borrowing capacity	475,000,000			$ 475,000,000
Revolving line of credit, maximum borrowing capacity	875,000,000			$ 875,000,000
Line of credit, expiration date			Feb. 28, 2018	Aug. 10, 2022
Renewal period of line of credit				1 year
$250 Million Senior Unsecured Revolving Line Of Credit ("Line of Credit") [Member] \| Minimum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				1.50%
$250 Million Senior Unsecured Revolving Line Of Credit ("Line of Credit") [Member] \| Maximum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				2.25%
$250 Million Unsecured Term Loan ("First Term Loan") [Member]
Revolving Line of Credit [Abstract]
Debt instrument, face amount	$ 225,000,000		$ 210,520,000	$ 225,000,000
$250 Million Unsecured Term Loan ("First Term Loan") [Member] \| Minimum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				1.45%
Fixed interest payment, percentage	3.211%			3.211%
$250 Million Unsecured Term Loan ("First Term Loan") [Member] \| Maximum [Member]
Revolving Line of Credit [Abstract]
Basis spread on variable rate (in hundredths)				2.20%
Revolving Line Of Credit [Member]
Revolving Line of Credit [Abstract]
Revolving line of credit, current borrowing capacity	$ 250,000,000			$ 250,000,000
Description of variable rate basis				one month U.S. LIBOR
Line of credit, financial covenant terms				The Credit Facility and the Term Loans include certain financial covenants and require that we maintain: (1) a minimum tangible net worth (calculated as total assets, plus accumulated depreciation, less total liabilities, intangibles and other defined adjustments) of $1,075,000, plus an amount equal to 75% of the net cash proceeds of all issuances and primary sales of equity interests of the parent guarantor or any of its subsidiaries consummated following the closing date; (2) annual distributions not to exceed 95% of adjusted funds from operations; and (3) certain financial ratios, including the following:· a fixed charge coverage ratio of not less than 1.50 to 1.00;· a maximum leverage ratio of not more than 60%; and· a maximum secured debt leverage ratio of 45%.The Company is in compliance with all of the covenants as of September 30, 2017.
Interest Expense, on credit facilities	$ 6,572,000	$ 3,983,000		$ 17,793,000	$ 12,546,000
Line of credit, weighted average interest rate (in hundredths)	3.61%	2.80%		3.35%	2.71%
"Term Loans" [Member]
Revolving Line of Credit [Abstract]
Deferred costs, net of accumulated amortization	$ 3,639,000			$ 3,639,000						$ 3,120,000