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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Unrealized gain on derivative instruments | $ 1,928 | $ 2,296
Liabilities |  |
Contingent consideration | 16,166 | 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 | 1,928 | 2,296
Liabilities |  |
Contingent consideration | 0 | 0
Level 3 |  |
Assets |  |
Unrealized gain on derivative instruments | 0 | 0
Liabilities |  |
Contingent consideration | $ 16,166 | $ 9,241

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