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Leases (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Leases [Abstract]    
Operating Leases, Rent Expense, Net $ 1,700,000 $ 1,500,000
Lessee, Operating Lease, Term of Contract 15 years  
Square feet under operating lease, gross | ft² 335,372  
Square feet under operating lease, net | ft² 255,110  
Leasehold Improvements, Gross $ 21,200,000  
Capital Lease Obligations $ 0