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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities |  |
Derivative liabilities | $ 1,100 |
Recurring |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | $ 930
Liabilities |  |
Contingent consideration | 7,302 | 12,545
Derivative liabilities | 1,108 | 0
Recurring | Level 1 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Level 2 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 930
Liabilities |  |
Contingent consideration | 0 | 0
Derivative liabilities | 1,108 | 0
Recurring | Level 3 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | 7,302 | 12,545
Derivative liabilities | $ 0 | $ 0

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