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Significant Accounting Policies - Goodwill and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Significant Accounting Policies [Abstract]      
Impairment of goodwill $ 2,800 $ 2,825  
Impairment of intangible asset $ 3,400 $ 3,360