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Debt Commitments - Unsecured Revolving Credit Facility (Details) - Credit Facility | 6 Months Ended
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Jun. 30, 2019 USD ($)
Debt Instrument [Line Items] |
Weighted per annum interest rate on outstanding line of credit | 3.40%
Minimum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.10%
Maximum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.125%
LIBOR |
Debt Instrument [Line Items] |
Per annum interest rate over LIBOR | 0.95%
Unsecured Revolving Credit Facility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 700,000,000.0
Letter of Credit Subfacility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 55,000,000.0

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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