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Schedule of Operating Lease Rental Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Total rent expense $ 55,674 $ 52,543 $ 55,061
Space Agreements [Member]      
Operating Leased Assets [Line Items]      
Total rent expense 39,035 37,061 40,848
Related Party Leases [Member]      
Operating Leased Assets [Line Items]      
Total rent expense 1,559 2,035 2,429
Other Operating Leases [Member]      
Operating Leased Assets [Line Items]      
Total rent expense $ 15,080 $ 13,447 $ 11,784