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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                      
Beginning balance $ (610,076)   $ (648,044) $ (668,894) $ (603,648) $ (579,196) $ (579,196) $ (579,196)      
Other comprehensive income (loss) before reclassifications 13,300     18,299 4,130 (73,799)          
Amounts reclassified from AOCL 2,772     2,551 5,514 4,951          
Other comprehensive income (loss) 16,072 $ 25,665 18,620 20,850 9,644 (68,848) (50,226) (24,562)      
Ending balance (594,004) (603,648)   (648,044) (594,004) (648,044)   (603,648)      
Foreign currency translation items                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                      
Beginning balance (467,326)   (518,377) (537,425) (456,437) (441,364) (441,364) (441,364)      
Other comprehensive income (loss) before reclassifications 13,998     19,048 3,109 (77,013)          
Amounts reclassified from AOCL 0     0 0 0          
Other comprehensive income (loss) 13,998     19,048 3,109 (77,013)          
Ending balance (453,328) (456,437)   (518,377) (453,328) (518,377)   (456,437)      
Pension and other post-retirement effects                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                      
Beginning balance (142,464)   (129,094) (130,852) (146,723) (137,161) (137,161) (137,161)      
Other comprehensive income (loss) before reclassifications (713)     (793) 804 3,116          
Amounts reclassified from AOCL 2,772     2,551 5,514 4,951          
Other comprehensive income (loss) 2,059     1,758 6,318 8,067          
Ending balance (140,405) (146,723)   (129,094) (140,405) (129,094)   (146,723)      
Cash flow hedging activity                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                      
Beginning balance (286)   $ (573) (617) (488) (671) $ (671) (671)      
Other comprehensive income (loss) before reclassifications 15     44 217 98          
Amounts reclassified from AOCL 0     0 0 0          
Other comprehensive income (loss) 15     44 217 98          
Ending balance (271) (488)   (573) (271) (573)   (488)      
Non- controlling Interests                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                      
Other comprehensive income (loss) 14     (63) 162 776          
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax $ (6,100) $ 5,900   $ 5,900 $ (6,100) $ 5,900   $ 5,900 $ 6,100 $ 5,900 $ 5,100