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Long-Lived Asset Impairment (Narratives) (Details) - Corporate Office Relocation - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Property, Plant and Equipment    
Remaining lease and relocation cost $ 2,113,000 $ 2,113,000
Impairment of leasehold improvements and furniture and fixtures    
Property, Plant and Equipment    
Remaining lease and relocation cost $ 795,000 $ 795,000