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Basis of Presentation and Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 519,878 |  |  | $ 506,000 |  |  | $ 1,566,606 | $ 1,393,685
Cost of operations | (373,783) |  |  | (357,732) |  |  | (1,133,760) | (999,390)
Income before Provision for Income Taxes | 91,882 |  |  | 94,506 |  |  | 274,410 | 235,117
Provision for Income Taxes | (18,687) |  |  | (19,508) |  |  | (61,199) | (52,009)
Other – net | 10,652 |  |  | 4,670 |  |  | 28,019 | 18,795
Net Income | 73,195 | $ 64,396 | $ 75,620 | 74,998 | $ 59,000 | $ 49,110 | 213,211 | 183,108
Accumulated Other Comprehensive Income (Loss) Component Recognized |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net Income | (456) |  |  | (447) |  |  | (2,006) | (1,513)
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 | (971) |  |  | (130) |  |  | (421) | (78)
Cost of operations | 1,282 |  |  | 228 |  |  | 295 | 93
Income before Provision for Income Taxes | 311 |  |  | 98 |  |  | (126) | 15
Provision for Income Taxes | (79) |  |  | (26) |  |  | 27 | (5)
Net Income | 232 |  |  | 72 |  |  | (99) | 10
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 | 141 |  |  | 130 |  |  | 475 | 421
Other – net | (829) |  |  | (649) |  |  | (2,382) | (1,944)
Net Income | $ (688) |  |  | $ (519) |  |  | $ (1,907) | $ (1,523)

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