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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Unrealized gain on derivative instruments | $ 930 | $ 2,296
Liabilities |  |
Contingent consideration | 12,545 | 9,241
Level 1 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 |  |
Assets |  |
Unrealized gain on derivative instruments | 930 | 2,296
Liabilities |  |
Contingent consideration | 0 | 0
Level 3 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | $ 12,545 | $ 9,241

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