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Property and Equipment Property and Equipment (Tables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and Equipment [Abstract]    
Land and building $ 767 $ 767
Leasehold Improvements, Gross 81,554 79,165
Machinery and Equipment, Gross 7,132 11,112
Furniture and Fixtures, Gross 8,629 8,881
Computer equipment 58,448 57,855
Property, Plant and Equipment, Gross 156,530 157,780
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (85,032) (85,399)
Property and equipment, net $ 71,498 $ 72,381