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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense | $ (20,525) | $ (17,477) | $ (38,116) | $ (35,219)
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) | 1,763 | (14,410) | 5,943 | (13,016)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense | (536) | (43) | (1,135) | (43)
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 | $ (536) | $ (43) | $ (1,135) | $ (43)

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