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Schedule of Operating Lease Rental Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Leased Assets [Line Items]    
Total rent expense $ 13,420 $ 13,288
Space Lease Agreements [Member]    
Operating Leased Assets [Line Items]    
Total rent expense 9,419 9,527
Related Party Leases [Member]    
Operating Leased Assets [Line Items]    
Total rent expense 408 576
Other Operating Leases [Member]    
Operating Leased Assets [Line Items]    
Total rent expense $ 3,593 $ 3,185