Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance For Doubtful Accounts Receivable Rollforward [Line Items]
Balance at Beginning of Period	$ 727	$ 518	$ 614
Charged to Costs and Expenses	444	333	195
Allowance From Acquisitions	25	181	0
Write Off of Uncollectible Accounts, Net of Recoveries	(437)	(305)	(291)
Balance at End of Period	$ 759	$ 727	$ 518