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Basis of Presentation and Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Revenues | $ 764,039 |  | $ 681,465 |  | $ 1,446,297 | $ 1,285,431
Cost of operations | (572,642) |  | (513,196) |  | (1,089,707) | (968,553)
Income before Provision for Income Taxes | 97,759 |  | 91,629 |  | 189,576 | 180,006
Provision for Income Taxes | (19,297) |  | (18,584) |  | (35,588) | (38,427)
Net Income | 78,462 | $ 75,526 | 73,045 | $ 68,534 | 153,988 | 141,579
Accumulated Other Comprehensive Income (Loss) Component Recognized |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net Income | (446) |  | (718) |  | (652) | (1,327)
Accumulated Other Comprehensive Income (Loss) Component Recognized | Realized gain (loss) on derivative financial instruments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Revenues | 192 |  | 125 |  | 115 | 91
Cost of operations | 77 |  | (191) |  | 323 | (75)
Income before Provision for Income Taxes | 269 |  | (66) |  | 438 | 16
Provision for Income Taxes | (58) |  | 17 |  | (95) | (4)
Net Income | 211 |  | (49) |  | 343 | 12
Accumulated Other Comprehensive Income (Loss) Component Recognized | Amortization of prior service cost on benefit obligations |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Provision for Income Taxes | 157 |  | 163 |  | 315 | 324
Net Income | (657) |  | (669) |  | (1,296) | (1,339)
Other – net | (814) |  | (832) |  | (1,611) | (1,663)
Accumulated Other Comprehensive Income (Loss) Component Recognized | Realized gains on investments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Provision for Income Taxes | 0 |  | 0 |  | (80) | 0
Net Income | 0 |  | 0 |  | 301 | 0
Other – net | $ 0 |  | $ 0 |  | $ 381 | $ 0

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