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Summary of Significant Accounting Policies (Schedule of Changes in AOCI Balances by Component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)