Schedule II Valuation Accounts (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 1,440	$ 1,340	$ 548
Net Additions to Expense		492	402	3,151
(Deductions)/Recoveries	[1]	110	(302)	(2,359)
Balance at End of Period		$ 2,042	$ 1,440	$ 1,340

[1] Primarily consists of write-offs, net of recoveries and other adjustments