Schedule II Valuation Accounts (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 2,042		$ 1,440	$ 1,340
Net Additions to Expense		6,225	[1]	492	402
(Deductions)/Recoveries	[2]	(96)		110	(302)
Balance at End of Period		$ 8,171		$ 2,042	$ 1,440

[1] Includes a $5.2 million reserve against a customer receivable.

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