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Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 21 $ 21
Other assets:    
Life insurance policies 25,218 22,121
Total assets measured at fair value 25,239 22,142
Other current liabilities:    
Contingent consideration 296 3,621
Total liabilities measured at fair value 296 3,621
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 21 21
Other assets:    
Life insurance policies 25,218 22,121
Total assets measured at fair value 25,239 22,142
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 296 3,621
Total liabilities measured at fair value $ 296 $ 3,621