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Financing Arrangements (Details) - USD ($)
$ in Thousands
Jan. 30, 2015
Mar. 31, 2017
Dec. 31, 2016
Financing Arrangements      
Sale leaseback obligation   $ 47,681 $ 47,586
Beverly Property Owner LLC | Sale leaseback obligation | Buildings      
Financing Arrangements      
Purchase price $ 48,900    
Lease term 22 years    
Sale leaseback obligation   47,700  
Security deposit   $ 5,900