SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances, beginning balance	$ 18,456	$ 22,675	$ 5,631
Valuation allowances, charged to expenses	1,829	5,514	16,257
Valuation allowances, charged to other accounts	250	(4)	1,399
Valuation allowances, deductions	10,111	9,729	612
Valuation allowances, ending balance	10,424	18,456	22,675
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances, beginning balance	3,558	3,115	3,189
Valuation allowances, charged to expenses	228	674	0
Valuation allowances, charged to other accounts	0	0	0
Valuation allowances, deductions	319	231	74
Valuation allowances, ending balance	$ 3,467	$ 3,558	$ 3,115