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Derivative Instruments - Notional and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 255,900 | $ 246,800
Fair Value | 12,630 | 15,550
Bank of America, N.A. |  |
Derivative [Line Items] |  |
Notional Amount | 93,800 | 85,100
Fair Value | 6,017 | 6,320
Barclays Bank PLC |  |
Derivative [Line Items] |  |
Notional Amount | 48,600 | 48,900
Fair Value | 902 | 1,828
Citigroup Inc. |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Fair Value | 0 | 0
Credit Suisse International |  |
Derivative [Line Items] |  |
Notional Amount | 21,100 | 21,100
Fair Value | 1,469 | 1,444
Societe Generale |  |
Derivative [Line Items] |  |
Notional Amount | 92,400 | 91,700
Fair Value | $ 4,242 | $ 5,958

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