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Subsequent Event (Details) - USD ($)
$ in Thousands
Jul. 27, 2018
Jun. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Property and equipment, net   $ 95,981 $ 98,762
Capital lease obligations   13,900  
Subsequent Event      
Subsequent Event [Line Items]      
Lease term, capital lease 10 years    
Capital lease obligations incurred $ 16,000    
Capital lease obligations, termination penalties $ 800    
Building      
Subsequent Event [Line Items]      
Property and equipment, net   $ 13,600