Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in valuation and qualifying accounts
Bad debt expense, net of recoveries	$ 2,800	$ 3,300	$ 3,700
Allowance for doubtful accounts (deducted from accounts receivable)
Movement in valuation and qualifying accounts
Balance at Beginning of Period	1,757	1,707	1,871
Charged to Costs and Expenses(a)	3,840	4,756	5,046
Deductions	(3,863)	(4,696)	(5,210)
Balance at End of Period	1,734	1,757	1,707
Allowance for Unfulfilled Customer Purchase Obligations (deducted from accounts receivable)
Movement in valuation and qualifying accounts
Balance at Beginning of Period	2,344	1,548	2,144
Charged to Costs and Expenses(a)	4,916	7,455	5,082
Deductions	(5,515)	(6,659)	(5,678)
Balance at End of Period	1,745	2,344	1,548
Deferred tax valuation allowance
Movement in valuation and qualifying accounts
Balance at Beginning of Period	213,538	345,250	354,537
Charged to Costs and Expenses(a)	3,102	1,058	10,436
Deductions	(6,300)	(132,770)	(19,723)
Balance at End of Period	$ 210,340	$ 213,538	$ 345,250