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Accounting for Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments: - Interest rate swaps - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Asset (Liability) |  |
Total derivatives | $ (12,402) | $ (5,984)
Intangible and other assets, net |  |
Fair Value Asset (Liability) |  |
Derivative assets | 0 | 45
Accrued liabilities |  |
Fair Value Asset (Liability) |  |
Derivative liabilities | (5,397) | (4,608)
Other long-term liabilities |  |
Fair Value Asset (Liability) |  |
Derivative liabilities | $ (7,005) | $ (1,421)

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