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Schedule of Operating Lease Rental Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Leased Assets [Line Items]        
Total rent expense $ 14,203 $ 12,960 $ 27,623 $ 26,248
Space Agreements [Member]        
Operating Leased Assets [Line Items]        
Total rent expense 10,003 9,112 19,422 18,639
Related Party Leases [Member]        
Operating Leased Assets [Line Items]        
Total rent expense 383 505 791 1,081
Other Operating Leases [Member]        
Operating Leased Assets [Line Items]        
Total rent expense $ 3,817 $ 3,343 $ 7,410 $ 6,528