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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 1,297,900 |  |  |  | $ 1,297,900 |
Net income | $ 17,000 |  |  | $ 77,700 |  |  | 38,300 | $ 150,700
Payments for Repurchase of Common Stock | 85,000 |  |  |  |  |  | 150,000 |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 4,900 | $ 300 |  |  |  |  |  |
Net other comprehensive income (loss) | 0 |  |  | 100 |  |  | (500) | 0
Ending balance | 1,200,000 |  |  |  |  |  | 1,200,000 |
Net changes in pension and other postretirement benefits | $ (100) | $ (100) |  | $ 0 |  |  | $ (300) | $ (100)
Treasury Stock, Shares, Acquired | 1,200 |  |  |  |  |  | 2,300 |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance (in shares) | 75,200 | 75,200 | 75,200 | 75,000 | 75,000 | 75,000 | 75,200 | 75,000
Beginning balance | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800
Net changes in pension and other postretirement benefits | 200 |  |  |  |  |  |  |
Ending balance (in shares) | 75,400 | 75,200 | 75,200 | 75,000 | 75,000 | 75,000 | 75,400 | 75,000
Ending balance | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800 | $ 800
Additional Paid-in Capital |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 1,110,300 | 1,103,600 | 1,097,900 | 1,089,700 | 1,086,400 | 1,083,000 | 1,097,900 | 1,083,000
Share-based compensation cost | 6,800 | 7,000 | 5,700 | 4,600 | 3,500 | 3,400 |  |
Shares Issued Under Share Based Compensation Plans, Amount |  |  |  | (2,300) |  |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  | (200) |  |  |
Ending balance | 1,112,200 | 1,110,300 | 1,103,600 | 1,092,000 | 1,089,700 | 1,086,400 | 1,112,200 | 1,092,000
Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400
Ending balance | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400 | 16,400
Retained Earnings |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 177,400 | 206,800 | 160,100 | 56,600 | (55,000) | (16,400) | 160,100 | (16,400)
Net income | 12,900 | (29,400) | 46,700 | 74,300 | 111,600 | (38,600) |  |
Ending balance | 190,300 | 177,400 | 206,800 | 130,900 | 56,600 | (55,000) | 190,300 | 130,900
AOCI |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 14,200 | 14,500 | 14,700 | (9,200) | (9,400) | (9,100) | 14,700 | (9,100)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  |  | (100) |  | (100) |  |  |
Net other comprehensive income (loss) | 100 | (200) | (100) | 100 | 300 | (300) |  |
Ending balance | 14,200 | 14,200 | 14,500 | (9,100) | (9,200) | (9,400) | 14,200 | (9,100)
Treasury Stock, Common |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | (65,000) | 0 | 0 |  |  |  | 0 |
Payments for Repurchase of Common Stock | (85,000) | (65,000) |  |  |  |  |  |
Ending balance | (150,000) | (65,000) | 0 |  |  |  | (150,000) |
Non-controlling Interest |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 12,000 | 9,900 | 8,000 | 2,700 | 1,500 | 2,700 | 8,000 | 2,700
Net income | 4,100 | 2,100 | 1,900 | 3,400 | 1,200 | (1,200) |  |
Ending balance | $ 16,100 | $ 12,000 | $ 9,900 | $ 6,100 | $ 2,700 | $ 1,500 | $ 16,100 | $ 6,100

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