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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures |  |
Amount of interest rate risk expected to be reclassified in the next 12 months | $ 400,000 |
Interest Rate Swap |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Notional amount | $ 200,000,000.0 |
Derivative instrument, underlying rate (percentage) | 1.85% |
Derivative instrument, effective rate (percentage) | 3.05% |
LIBOR | Interest Rate Swap |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Derivative instrument, variable rate (percentage) | 1.20% |
Term Loan |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Debt instrument face amount | $ 200,000,000.0 |
Loans Payable |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Derivative, contract term (years) |  | 3 years
Loans Payable | LIBOR | Minimum |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Debt instrument, variable rate on spread | 1.20% |
Loans Payable | LIBOR | Maximum |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Debt instrument, variable rate on spread | 1.90% |

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- Definition Derivative Instrument, Effective Interest Rate + References No definition available. + Details
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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 Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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