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Fair Value Measurements (Schedule of Fair Value for Financial Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | ---
Assets |  |
Total assets measured at fair value | $ 428 | $ 1,459
Liabilities |  |
Acquisition-related contingent consideration obligations | 8,649 | 12,749
Total liabilities measured at fair value | 8,649 | 12,749
Marketable securities |  |
Assets |  |
Investments | 428 | 1,459
Level 1 |  |
Assets |  |
Total assets measured at fair value | 428 | 1,459
Level 1 | Marketable securities |  |
Assets |  |
Investments | 428 | 1,459
Level 3 |  |
Liabilities |  |
Acquisition-related contingent consideration obligations | 8,649 | 12,749
Total liabilities measured at fair value | $ 8,649 | $ 12,749

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