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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 581 $ 890 $ 454
Provision 863 412 829
Acquisitions 0 0 400
Divestitures (230) 0 0
Writeoffs, net of recoveries (556) (721) (793)
Balance at end of year $ 658 $ 581 $ 890