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Debt - Unsecured Revolving Credit and Term Loan Facility (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2017 USD ($) option | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Loss on early extinguishment of debt |  | $ 2,157,000 | $ 552,000 | $ 1,749,000
Unsecured facility |  | 0 | 0 |
Unsecured revolving credit facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Loss on early extinguishment of debt |  | 2,200,000 |  |
Current borrowing capacity | $ 1,100,000,000.0 |  |  |
Unsecured facility |  | 0 | 0 |
Option to extend maturity, number | option | 2 |  |  |
Extension period | 6 months |  |  |
Maximum leverage ratio | 60.00% |  |  |
Maximum consolidated secured indebtedness to asset value | 40.00% |  |  |
Minimum tangible net worth | $ 1,200,000,000.0 |  |  |
Tangible net worth, minimum percent of net equity proceeds received | 75.00% |  |  |
Minimum adjusted EBITDA to consolidated fixed charges | 1.50 |  |  |
Minimum net operating income to unsecured debt | 1.75 |  |  |
Maximum ratio of unsecured debt to unencumbered asset value | 60.00% |  |  |
Unsecured Revolving Credit Facility And Term Loan [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,365,000,000.000 |  |  |
Unsecured revolving credit facility higher borrowing capacity option | 1,750,000,000.00 |  |  |
Term Loan [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Current borrowing capacity | 265,000,000 |  |  |
Unsecured facility | $ 265,000,000 | $ 265,000,000 | $ 265,000,000 |
Minimum [Member] | Unsecured revolving credit facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Extension fee percent of outstanding commitments under revolving credit facility | 0.0625% |  |  |
Maximum [Member] | Unsecured revolving credit facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Extension fee percent of outstanding commitments under revolving credit facility | 0.075% |  |  |

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- Definition Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Indebtedness to Asset Value + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Minimum Net Operating Income to Unsecured Debt + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Minimum Tangible Net Worth + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + 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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