Fair Value Measurements (Fair Value of Financial Assets and Liabilities) (Details 1) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets | ||||||||||||||
| Money Market Investments | $ 7,300 | $ 5,300 | ||||||||||||
| Marketable equity securities | 1,083,092 | 1,081,938 | ||||||||||||
| Fair Value, Recurring [Member] | ||||||||||||||
| Assets | ||||||||||||||
| Money Market Investments | [1] | 7,285 | 5,251 | |||||||||||
| Marketable equity securities | [2] | 1,083,092 | 1,081,938 | |||||||||||
| Other current investments | [3] | 6,209 | 7,032 | |||||||||||
| Total Financial Assets | 1,096,586 | 1,094,221 | ||||||||||||
| Liabilities | ||||||||||||||
| Interest rate swaps | [4] | 1,033 | 2,289 | |||||||||||
| Mandatorily redeemable noncontrolling interest | [5] | 7,423 | 8,401 | |||||||||||
| Contingent consideration liabilities | [6] | 1,526 | ||||||||||||
| Total Financial Liabilities | 8,456 | 12,216 | ||||||||||||
| Level 1 | Fair Value, Recurring [Member] | ||||||||||||||
| Assets | ||||||||||||||
| Money Market Investments | [1] | 0 | 0 | |||||||||||
| Marketable equity securities | [2] | 1,083,092 | 1,081,938 | |||||||||||
| Other current investments | [3] | 0 | 0 | |||||||||||
| Total Financial Assets | 1,083,092 | 1,081,938 | ||||||||||||
| Liabilities | ||||||||||||||
| Interest rate swaps | [4] | 0 | 0 | |||||||||||
| Mandatorily redeemable noncontrolling interest | [5] | 0 | 0 | |||||||||||
| Contingent consideration liabilities | [6] | 0 | ||||||||||||
| Total Financial Liabilities | 0 | 0 | ||||||||||||
| Level 2 | Fair Value, Recurring [Member] | ||||||||||||||
| Assets | ||||||||||||||
| Money Market Investments | [1] | 7,285 | 5,251 | |||||||||||
| Marketable equity securities | [2] | 0 | 0 | |||||||||||
| Other current investments | [3] | 6,209 | 7,032 | |||||||||||
| Total Financial Assets | 13,494 | 12,283 | ||||||||||||
| Liabilities | ||||||||||||||
| Interest rate swaps | [4] | 1,033 | 2,289 | |||||||||||
| Mandatorily redeemable noncontrolling interest | [5] | 0 | 0 | |||||||||||
| Contingent consideration liabilities | [6] | 0 | ||||||||||||
| Total Financial Liabilities | 1,033 | 2,289 | ||||||||||||
| Level 3 | Fair Value, Recurring [Member] | ||||||||||||||
| Assets | ||||||||||||||
| Money Market Investments | [1] | 0 | 0 | |||||||||||
| Marketable equity securities | [2] | 0 | 0 | |||||||||||
| Other current investments | [3] | 0 | 0 | |||||||||||
| Total Financial Assets | 0 | 0 | ||||||||||||
| Liabilities | ||||||||||||||
| Interest rate swaps | [4] | 0 | 0 | |||||||||||
| Mandatorily redeemable noncontrolling interest | [5] | 7,423 | 8,401 | |||||||||||
| Contingent consideration liabilities | [6] | 1,526 | ||||||||||||
| Total Financial Liabilities | $ 7,423 | $ 9,927 | ||||||||||||
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