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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 02, 2007
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2008
Investments, Other Investments [Line Items]                  
Goodwill, Impairment Loss           $ 46,792 $ 0 $ 0  
Gain (loss) on investment accounted for under the fair value method           $ (30,600) (33,800) (1,600)  
kaleo                  
Investments, Other Investments [Line Items]                  
Total cash invested in private company                 $ 7,500
Ownership interest percentage           20.00%      
Gain (loss) on investment accounted for under the fair value method [1]           $ (30,600) (33,800) (1,600)  
Unrealized gain (loss) on investments, net of tax           $ 23,900 $ 24,000 1,200  
Weighted average cost of capital   45.00%       45.00% 45.00%    
Basis point decrease of weighted average cost of capital assumption   5.00%       5.00%      
Basis point increase of weighted average cost of capital assumption   5.00%       5.00%      
Harbinger                  
Investments, Other Investments [Line Items]                  
Total cash invested in private company $ 10,000                
Unrealized loss on investments under fair value method, other than temporary impairment   $ 200 $ 100 $ 200   $ 500      
Unrealized loss on investments, net of tax   200 100 $ 100          
Maximum | Harbinger                  
Investments, Other Investments [Line Items]                  
Percent ownership in investment (less than) 1.00%                
Other Assets and Deferred Charges [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
Carrying value   84,600       84,600 $ 54,000    
Other Assets and Deferred Charges [Member] | Harbinger                  
Investments, Other Investments [Line Items]                  
Carrying value of investment   $ 1,300       1,300 1,700    
Other Assets and Deferred Charges [Member] | Alleghany and Bath County, Virginia                  
Investments, Other Investments [Line Items]                  
Carrying value of investment             1,600    
Alleghany and Bath County, Virginia                  
Investments, Other Investments [Line Items]                  
Gain (loss) on investment accounted for under the fair value method         $ (1,000) 186 0 1,032  
Gain (Loss) on Sale of Properties     200     200      
Unrealized Gain (Loss) on Investment Property           (186) 0 (1,032)  
Unrealized Gain Loss On Investment Property After Tax         $ (700)     700  
Gain (Loss) on Sale of Investment Property, After Tax     $ 200     $ 200      
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           15.00%      
Weighting of EBITDA Multiple Method versus DCF Method   50.00%       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%       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%       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%       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%       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%       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%       0.00%      
7.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
EV-to-Adjusted EBITDA Multiple           7.6x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   $ 76,300       $ 76,300      
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   73,800       73,800      
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   71,400       71,400      
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   69,000       69,000      
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   66,500       66,500      
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   64,100       $ 64,100      
8.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
EV-to-Adjusted EBITDA Multiple           8.6x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   81,200       $ 81,200      
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   79,700       79,700      
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   78,300       78,300      
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   76,800       76,800      
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   75,400       75,400      
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   73,900       $ 73,900      
9.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
EV-to-Adjusted EBITDA Multiple           9.6x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   86,100       $ 86,100      
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   85,600       85,600      
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   85,100       85,100      
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   84,600       84,600      
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   84,200       84,200      
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   83,700       $ 83,700      
10.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
EV-to-Adjusted EBITDA Multiple           10.6x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   91,000       $ 91,000      
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   91,500       91,500      
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   92,000       92,000      
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   92,500       92,500      
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   93,000       93,000      
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   93,500       $ 93,500      
11.6x [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo                  
Investments, Other Investments [Line Items]                  
EV-to-Adjusted EBITDA Multiple           11.6x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple   95,900       $ 95,900      
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   97,300       97,300      
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   98,800       98,800      
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   100,300       100,300      
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   101,800       101,800      
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   $ 103,300       103,300      
Personal Care Materials [Member]                  
Investments, Other Investments [Line Items]                  
Goodwill, Impairment Loss           $ (46,800) $ 0 $ 0  
[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.