SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts and sales returns and allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 5,659	$ 5,126	$ 4,837
Charged to Costs and Expenses	1,262	2,211	1,292
Charged to Other Accounts	0	0	0
Deductions	(1,349)	(1,678)	(1,003)
Balance at End of Period	5,572	5,659	5,126
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	6,772	7,283	12,213
Charged to Costs and Expenses	80	3	(5,326)
Charged to Other Accounts	0	0	0
Deductions	(1,965)	(514)	396
Balance at End of Period	$ 4,887	$ 6,772	$ 7,283