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Schedule of Operating Lease Rental Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Rent expense        
Operating Leases, Rent Expense $ 12,960 $ 13,826 $ 26,248 $ 27,392
Space Lease Agreements [Member]        
Rent expense        
Operating Leases, Rent Expense 9,112 10,309 18,639 20,446
Related Party Leases [Member]        
Rent expense        
Operating Leases, Rent Expense 505 703 1,081 1,405
Other Operating Leases [Member]        
Rent expense        
Operating Leases, Rent Expense $ 3,343 $ 2,814 $ 6,528 $ 5,541