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Schedule of Operating Lease Rental Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating Leased Assets [Line Items]        
Total rent expense $ 13,748 $ 13,144 $ 41,371 $ 39,392
Space Agreements [Member]        
Operating Leased Assets [Line Items]        
Total rent expense 9,559 9,245 28,981 27,884
Related Party Leases [Member]        
Operating Leased Assets [Line Items]        
Total rent expense 384 469 1,175 1,550
Other Operating Leases [Member]        
Operating Leased Assets [Line Items]        
Total rent expense $ 3,805 $ 3,430 $ 11,215 $ 9,958