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Financial Instruments and Fair Values - Effect of Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) | $ 3,884 | $ (1,638) | $ 9,827 | $ (14,654)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense | (427) | (359) | (1,562) | (402)
Interest expense | (20,658) | (16,890) | (58,774) | (52,109)
Interest Rate Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) | 3,884 | (1,638) | 9,827 | (14,654)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense | (427) | (359) | (1,562) | (402)
Accumulated net gain (loss) from cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense | $ (427) | $ (359) | $ (1,562) | $ (402)

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