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Commitments And Contingencies (Narrative) (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 28, 2015 USD ($) | Aug. 23, 2013 lawsuit | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) lawsuit | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Commitments And Contingencies [Abstract] |  |  |  |  |  |  |
Rent expense under operating leases |  |  | $ 4,009 | $ 3,542 | $ 11,461 | $ 9,717 |
Total liabilities recorded for earnouts |  |  | 8,317 |  | 8,317 |  | $ 10,806
Redeemable noncontrolling interests |  |  | $ 8,872 |  | $ 8,872 |  | $ 8,872
Number of stockholder class action lawsuits | lawsuit |  | 2 |  |  | 9 |  |
Provision for arbitration award | $ 11,282 |  |  |  |  |  |
Alleged actual damages | 7,254 |  |  |  |  |  |
Fees and expenses | 2,318 |  |  |  |  |  |
Prejudgment interest | $ 1,710 |  |  |  |  |  |

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