Schedule II - Valuation And Qualifying 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	[1],[2]	$ (253)	$ (15,175)	$ (14,236)
(CHARGED) CREDITED TO COSTS AND EXPENSES	[1],[2]	(116)	(247)	(17,376)
(CHARGED) CREDITED TO OTHER ACCOUNTS	[1],[2]		(1,436)	(1,360)
DEDUCTIONS	[1],[2],[3]	16	16,605	17,797
BALANCE AT END OF PERIOD	[1],[2]	$ (353)	$ (253)	$ (15,175)

[1] Beginning on January 1, 2018, in accordance with ASU 2014-09, Revenue with Contracts with Customers, revenue reductions resulting from implicit price concessions are recorded as a net reduction in accounts receivable. The remaining allowance for doubtful accounts relates to amounts deemed uncollectible due to an adverse change in our customer’s ability to pay. See Footnote 2 to the Company’s Consolidated Financial Statements for a full description.

[2] Classified in consolidated balance sheets as a reduction of accounts receivable.

[3] With respect to allowances for doubtful accounts, deductions include accounts considered uncollectible or written off, payments companies divested, etc.