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Summary of Significant Accounting Policies (Accounts Receivable, Net) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
allowance for doubtful accounts Receivable due to Acquisitions $ 87    
Self Insurance Reserve, Additions from Acquisitions 14 $ 0 $ 0
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance, January 1, 2,087 1,971 2,913
Additions 345 361 277
Deductions (548) (245) (1,219)
Ending balance $ 1,971 $ 2,087 $ 1,971