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Financial Instruments - Narratives (Details) € in Thousands, MMBTU in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) MMBTU | Nov. 13, 2018 USD ($) | Sep. 30, 2018 EUR (€)
Derivative |  |  |  |
Document Period End Date |  | Sep. 30, 2018 |  |
Derivative, notional quantity (in MMBTU) | MMBTU |  | 4.6 |  |
Amount of derivative loss expected to be transferred from OCI |  | $ 294,000 |  |
Interest rate caps |  |  |  |
Derivative |  |  |  |
Premium paid to acquire derivative instrument | $ 1,551,000 |  |  |
Derivative, cap interest rate |  | 2.50% |  | 2.50%
Derivative, notional amount | $ 1,000,000,000 |  |  |
Interest rate caps | Minimum |  |  |  |
Derivative |  |  |  |
Derivative, cap interest rate | 1.50% |  |  |
Interest rate caps | Maximum |  |  |  |
Derivative |  |  |  |
Derivative, cap interest rate | 3.00% |  |  |
Interest rate cap II | Subsequent Event |  |  |  |
Derivative |  |  |  |
Derivative, cap interest rate |  |  | 3.50% |
Derivative, notional amount |  |  | $ 500,000,000 |
Currency swap |  |  |  |
Derivative |  |  |  |
Derivative instrument |  | $ 324,940,000 |  | € 280,000

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + 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 Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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