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Summary of Significant Accounting Policies (Accounts Receivable, Net) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance, January 1, $ 2,072 $ 1,971 $ 2,087
Additions 180 478 345
Account Receivable, Additions from Acquisitions 1,425 0 87
Deductions (70) (377) (548)
Ending balance, December 31, $ 3,607 $ 2,072 $ 1,971