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Goodwill and Intangible Assets - Intangibles Other Than Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Intangible assets and other assets:        
Gross Carrying Amount     $ 33,122 $ 33,122
Accumulated Amortization     (14,775) (11,540)
Aggregate Impairment Charges $ (4,900) $ (13,400) (18,347)  
Net Carrying Amount       21,582
Amortization of intangible assets     3,200 4,200
Trademark        
Intangible assets and other assets:        
Gross Carrying Amount     17,251 17,251
Accumulated Amortization     (3,801) (3,216)
Aggregate Impairment Charges     (13,450)  
Net Carrying Amount       14,035
Customer relationships        
Intangible assets and other assets:        
Gross Carrying Amount     10,170 10,170
Accumulated Amortization     (5,273) (4,143)
Aggregate Impairment Charges     (4,897)  
Net Carrying Amount       6,027
Non-compete agreement        
Intangible assets and other assets:        
Gross Carrying Amount     5,701 5,701
Accumulated Amortization     $ (5,701) (4,181)
Net Carrying Amount       $ 1,520