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Financing Arrangements (Details) - USD ($)
$ in Thousands
Jan. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Financing Arrangements      
Finance lease obligations   $ 48,548  
Finance lease obligation   48,149 $ 47,757
Sale leaseback obligation      
Financing Arrangements      
Finance lease obligations   48,500  
Sale leaseback obligation current   400  
Security deposit   $ 5,900  
Beverly Property Owner LLC | Sale leaseback obligation | Buildings      
Financing Arrangements      
Sale price $ 48,900    
Lease term 22 years