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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2008
Investments, Other Investments [Line Items]          
Goodwill, Impairment Loss   $ 0 $ 46,792 $ 0  
Gain (loss) on investment accounted for under the fair value method   $ (10,900) (30,600) (33,800)  
kaleo          
Investments, Other Investments [Line Items]          
Other Interest and Dividend Income $ 17,600        
Total cash invested in private company         $ 7,500
Ownership interest percentage   18.00%      
Gain (loss) on investment accounted for under the fair value method [1]   $ (28,482) (30,600) (33,800)  
Unrealized gain (loss) on investments, net of tax   23,400 23,900    
Other Assets and Deferred Charges [Member] | kaleo          
Investments, Other Investments [Line Items]          
Carrying value   95,500 84,600    
Alleghany and Bath County, Virginia          
Investments, Other Investments [Line Items]          
Gain (loss) on investment accounted for under the fair value method   0 186 0  
Unrealized Gain (Loss) on Investment Property   $ 0 $ 186 $ 0  
DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate   10.00% 15.00%    
Weighting of EBITDA Multiple Method versus DCF Method   50.00%      
EBITDA Multiple Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   80.00%      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   40.00%      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   30.00%      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   20.00%      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   10.00%      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Weighting of EBITDA Multiple Method versus DCF Method   0.00%      
7.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
EV-to-Adjusted EBITDA Multiple   7.0 x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
7.6x [Domain] | 40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
7.6x [Domain] | 30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
7.6x [Domain] | 20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
7.6x [Domain] | 10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
7.6x [Domain] | 0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
8.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
EV-to-Adjusted EBITDA Multiple   8.0 x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
8.6x [Domain] | 40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
8.6x [Domain] | 30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
8.6x [Domain] | 20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
8.6x [Domain] | 10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
8.6x [Domain] | 0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
9.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
EV-to-Adjusted EBITDA Multiple   9.0 x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
9.6x [Domain] | 40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
9.6x [Domain] | 30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
9.6x [Domain] | 20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
9.6x [Domain] | 10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
9.6x [Domain] | 0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
10.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
EV-to-Adjusted EBITDA Multiple   10.0x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
10.6x [Domain] | 40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
10.6x [Domain] | 30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
10.6x [Domain] | 20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
10.6x [Domain] | 10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
10.6x [Domain] | 0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
11.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
EV-to-Adjusted EBITDA Multiple   11.0x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 100      
11.6x [Domain] | 40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
11.6x [Domain] | 30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
11.6x [Domain] | 20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
11.6x [Domain] | 10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
11.6x [Domain] | 0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo          
Investments, Other Investments [Line Items]          
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   100      
Personal Care Materials [Member]          
Investments, Other Investments [Line Items]          
Goodwill, Impairment Loss   $ 0 $ (46,792)    
[1] See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.