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Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Indefinite-lived intangible assets:    
Gross Carrying Amount $ 45,860 $ 45,860
Accumulated Impairment (1,770) (1,770)
Net 44,090 44,090
Gross Carrying Amount 11,112 11,112
Accumulated Impairment 0 0
Net 11,112 11,112
Amortizable intangible assets:    
Gross Carrying Amount 3,500 3,500
Accumulated Amortization (1,769) (1,594)
Net 1,731 1,906
Trademarks [Member]    
Indefinite-lived intangible assets:    
Gross Carrying Amount 34,748 34,748
Accumulated Impairment (1,770) (1,770)
Net $ 32,978 32,978
Amortizable intangible assets Customer relationships [Member]    
Amortizable intangible assets:    
Weighted Average Life (Years) 15 years  
Gross Carrying Amount $ 3,500 3,500
Accumulated Amortization (1,769) (1,594)
Net $ 1,731 $ 1,906