Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details)

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Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment, other than temporary impairment   $ 100 $ 900
Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment, other than temporary impairment   100  
Cleancor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business acquisition, percentage of voting interests acquired 50.00%    
Cleancor | Equity in Earnings of 50% or Less Owned Companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business combination, step acquisition, equity interest in acquiree, remeasurement gain $ 100    
Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at equity, and advances in 50% or less owned companies   0  
Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at equity, and advances in 50% or less owned companies   3,219  
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at equity, and advances in 50% or less owned companies   $ 0