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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	6 Months Ended
	Jun. 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	(4)
Actual return on assets still held at period end	(5)
Purchases	4,011
Sales	(1,011)
Ending balance	$ 2,991

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