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Fair Value of Derivative and Other Financial Instruments - Reconciliation of changes in Level 3 fair value measurements (Details) - Corporate Debt - Level 3 $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Beginning balance | $ 0
Actual return on assets sold during the period | (6)
Actual return on assets still held at period end | 16
Purchases | 5,234
Sales | (2,190)
Ending balance | $ 3,054

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