SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
Deductions from asset accounts:
Balance at Beginning of Period		$ 10,579	$ 10,424	$ 18,456
Additions, Charged to Expenses		2,830	5,116	1,829
Additions, Charged to Other Accounts	[1]	(7)	(3,107)	250
Deductions	[2]	2,519	1,854	10,111
Balance at End of Period		10,883	10,579	10,424
Valuation allowance for deferred tax assets
Deductions from asset accounts:
Balance at Beginning of Period		46,283	3,467	3,558
Additions, Charged to Expenses		468	42,816	228
Additions, Charged to Other Accounts		0	0	0
Deductions		0	0	319
Balance at End of Period		$ 46,751	$ 46,283	$ 3,467

[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.