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 receivables
VALUATION AND QUALIFYING ACCOUNTS
Balance at the beginning of the period	$ 3,986	$ 4,379	$ 4,825
Additions, Charged to costs and expenses	(158)	3,552	2,411
Deductions from reserves	(2,840)	(3,945)	(2,857)
Balance at the end of the period	988	3,986	4,379
Deferred tax valuation allowance
VALUATION AND QUALIFYING ACCOUNTS
Balance at the beginning of the period	1,903	808	101
Additions, Charged to costs and expenses	17,119	1,127	776
Additions, Charged to other accounts	533
Deductions from reserves	(325)	(32)	(69)
Balance at the end of the period	$ 19,230	$ 1,903	$ 808