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Summary of Significant Accounting Policies (Schedule of Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | $ 1,291,588 |  |
Balance at the beginning of the period, noncontrolling interests | (7,677) |  |
Other comprehensive income (loss) before reclassifications | 4,482 | $ 5,912 | $ (5,357)
Amounts reclassified from AOCI | 1,317 | 1,338 | 1,955
Other comprehensive income (loss) | (1,752) | 999 | (2,272)
Balance at the end of the period | 1,134,723 | 1,291,588 |
Balance at the end of the period, noncontrolling interests | 23,883 | (7,677) |
AOCI Attributable to Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | (39,787) | (47,037) | (43,635)
Balance at the end of the period | (33,988) | (39,787) | (47,037)
Defined Benefit Pension Plan |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | (29,354) | (32,637) | (37,866)
Other comprehensive income (loss) before reclassifications | 4,566 | 2,036 | 3,370
Amounts reclassified from AOCI | 1,216 | 1,247 | 1,859
Balance at the end of the period | (23,572) | (29,354) | (32,637)
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | (6,893) | (7,241) | (5,787)
Other comprehensive income (loss) before reclassifications | (1,764) | 348 | (1,454)
Amounts reclassified from AOCI | 0 | 0 | 0
Balance at the end of the period | (8,657) | (6,893) | (7,241)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | (3,540) | (7,159) | 18
Other comprehensive income (loss) before reclassifications | 1,680 | 3,528 | (7,273)
Amounts reclassified from AOCI | 101 | 91 | 96
Balance at the end of the period | (1,759) | (3,540) | (7,159)
AOCI Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period, noncontrolling interests | (731) | (1,730) | 542
Balance at the end of the period, noncontrolling interests | (2,483) | (731) | (1,730)
Defined Benefit Pension Plan |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period, noncontrolling interests | 0 | 0 | 0
Other comprehensive income (loss) | 0 | 0 | 0
Balance at the end of the period, noncontrolling interests | 0 | 0 | 0
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period, noncontrolling interests | (312) | (799) | 542
Other comprehensive income (loss) | (2,111) | 487 | (1,341)
Balance at the end of the period, noncontrolling interests | (2,423) | (312) | (799)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period, noncontrolling interests | (419) | (931) | 0
Other comprehensive income (loss) | 359 | 512 | (931)
Balance at the end of the period, noncontrolling interests | $ (60) | $ (419) | $ (931)

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