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Financing Arrangements (Details) - USD ($)
$ in Thousands
Jan. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Financing Arrangements      
Sale leaseback obligation   $ 47,586 $ 47,586
Sale leaseback obligation | Land and buildings | Beverly Property Owner LLC      
Financing Arrangements      
Purchase price $ 48,900    
Lease term 22 years    
Sale leaseback obligation   $ 47,600  
Security deposit $ 5,900