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
VALUATION AND QUALIFYING ACCOUNTS
Balance at the Beginning of the Period	$ 4,251	$ 4,416	$ 6,751
Charged to Costs and Expenses	(813)	741	(381)
Deductions from Reserve	(728)	(906)	(1,954)
Balance at the End of the Period	2,710	4,251	4,416
Deferred tax valuation allowance
VALUATION AND QUALIFYING ACCOUNTS
Balance at the Beginning of the Period	7,734	4,840	7,033
Charged to Costs and Expenses	564	3,396	2,708
Deductions from Reserve	(2,173)	(502)	(4,901)
Balance at the End of the Period	$ 6,125	$ 7,734	$ 4,840