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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Unrealized gain on derivative instruments | $ 1,478 | $ 930
Liabilities |  |
Contingent consideration | 10,323 | 12,545
Level 1 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 |  |
Assets |  |
Unrealized gain on derivative instruments | 1,478 | 930
Liabilities |  |
Contingent consideration | 0 | 0
Level 3 |  |
Assets |  |
Unrealized gain on derivative instruments | $ 0 | 0
Liabilities |  |
Contingent consideration |  | $ 12,545

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