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Derivative Instruments - Summary of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative assets |  |
Derivative instruments | $ 48,186 | $ 4,464
Derivative liabilities |  |
Total derivative instrument assets | 48,186 | 4,464
Total derivative instrument liabilities | 13,848 | 12,968
Derivatives designated as hedging instruments: | Interest rate swaps |  |
Derivative assets |  |
Derivative instruments | 6,046 | 0
Derivative liabilities |  |
Derivative liability, current | 0 | 5,218
Derivatives designated as hedging instruments: | Net investment cross currency swaps |  |
Derivative liabilities |  |
Derivative liability, noncurrent | 1,451 | 0
Derivatives not designated as hedging instruments: | Interest rate swaps |  |
Derivative liabilities |  |
Derivative liability, current | 179 | 0
Derivative liability, noncurrent | 0 | 330
Derivatives not designated as hedging instruments: | Cross currency and interest rate swaps |  |
Derivative liabilities |  |
Derivative liability, current | 4,279 | 0
Derivative liability, noncurrent | 7,939 | 7,420
Derivatives not designated as hedging instruments: | Contingent redemption features - Series A Preferred Stock |  |
Derivative assets |  |
Derivative instruments | $ 42,140 | $ 4,464

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