SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
Deductions from asset accounts:
Balance at Beginning of Period		$ 10,883	$ 10,579	$ 10,424
Additions, Charged to Expenses		720	2,830	5,116
Additions, Charged to Other Accounts	[1]	(70)	(7)	(3,107)
Deductions	[2]	7,061	2,519	1,854
Balance at End of Period		4,472	10,883	10,579
Valuation allowance for deferred tax assets
Deductions from asset accounts:
Balance at Beginning of Period		46,751	46,283	3,467
Additions, Charged to Expenses		308,808	468	42,816
Additions, Charged to Other Accounts		0	0	0
Deductions		0	0	0
Balance at End of Period		$ 355,559	$ 46,751	$ 46,283

[1] For allowance for doubtful accounts, primarily includes amounts previously written off which were credited directly to this account when recovered.

[2] For allowance for doubtful accounts, amounts written off as uncollectible or transferred to other accounts or utilized.