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Derivative Instruments (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 13, 2018 USD ($) | Dec. 31, 2018 USD ($) instrument | Dec. 31, 2017 agreement
Derivative Instruments |  |  |
Number of Instruments used for trading | instrument |  | 0 |
Interest rate swap |  |  |
Derivative Instruments |  |  |
Notional Amount | $ | $ 165.0 | $ 160.9 |
Notional amount interest rate | 75.00% |  |
Notional amount adjustment | 75.00% |  |
Interest rate swap agreements outstanding | agreement |  |  | 0

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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