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Supplemental Equity Information - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 995,041 |  | $ 995,041 | $ 2,553,005
Amounts reclassified from AOCL | $ 1,851 |  | $ 23,375 | 8,445 | 35,827
Other comprehensive income, net of tax | 1,828 |  | 26,213 | 8,855 | 40,060
Reclassification of stranded tax effects to retained earnings |  | 24,800 |  |  |
Ending Balance | 1,205,583 |  | 705,875 | 1,205,583 | 705,875
Retirement Plans |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning Balance | (125,288) | (107,037) | (124,632) | (107,037) | (127,341)
Other comprehensive income (loss) before reclassifications | 0 |  | 0 | 0 | 0
Amounts reclassified from AOCL | 1,851 |  | 1,351 | 8,445 | 4,060
Other comprehensive income, net of tax | 1,851 |  | 1,351 | 8,445 | 4,060
Reclassification of stranded tax effects to retained earnings |  |  |  | (24,845) |
Ending Balance | (123,437) |  | (123,281) | (123,437) | (123,281)
Foreign Currency Translation |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning Balance | 547 | 114 | (23,608) | 114 | (28,560)
Other comprehensive income (loss) before reclassifications | (23) |  | 1,428 | 410 | 6,380
Amounts reclassified from AOCL | 0 |  | 22,024 | 0 | 22,024
Other comprehensive income, net of tax | (23) |  | 23,452 | 410 | 28,404
Reclassification of stranded tax effects to retained earnings |  |  |  | 0 |
Ending Balance | 524 |  | (156) | 524 | (156)
Other |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 | 2,364 | 0 | (5,672)
Other comprehensive income (loss) before reclassifications | 0 |  | 0 | 0 | (1,707)
Amounts reclassified from AOCL | 0 |  | 0 | 0 | 9,743
Other comprehensive income, net of tax | 0 |  | 0 | 0 | 8,036
Reclassification of stranded tax effects to retained earnings |  |  |  | 0 |
Ending Balance | 0 |  | 2,364 | 0 | 2,364
Total |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning Balance | (124,741) | $ (106,923) | (145,876) | (106,923) | (161,573)
Other comprehensive income (loss) before reclassifications | (23) |  | 1,428 | 410 | 4,673
Amounts reclassified from AOCL | 1,851 |  | 23,375 | 8,445 | 35,827
Other comprehensive income, net of tax | 1,828 |  | 24,803 | 8,855 | 40,500
Reclassification of stranded tax effects to retained earnings |  |  |  | (24,845) |
Ending Balance | $ (122,913) |  | $ (121,073) | $ (122,913) | $ (121,073)

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