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Property and Equipment Property and Equipment (Tables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property and Equipment [Abstract]    
Land and building $ 767 $ 767
Leasehold Improvements, Gross 84,512 81,554
Machinery and Equipment, Gross 7,098 7,132
Furniture and Fixtures, Gross 9,039 8,629
Computer equipment 58,089 58,448
Property, Plant and Equipment, Gross 159,505 156,530
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (94,698) (85,032)
Property and equipment, net $ 64,807 $ 71,498