SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Description
Balance at beginning of year	$ 4,446	$ 2,999	$ 4,182
Additions (reductions) charged (credited) to expense	9,544	11,217	8,658
Deductions	9,688	9,770	9,841
Balance at End of Year	4,302	4,446	2,999
Reserve for bad debts
Description
Balance at beginning of year	1,300	1,398	1,462
Additions (reductions) charged (credited) to expense	267	29	16
Deductions	157	127	80
Balance at End of Year	1,410	1,300	1,398
Reserve for cash discounts
Description
Balance at beginning of year	668	644	680
Additions (reductions) charged (credited) to expense	9,678	9,667	9,725
Deductions	9,531	9,643	9,761
Balance at End of Year	815	668	644
Deferred tax asset valuation
Description
Balance at beginning of year	2,478	957	2,040
Additions (reductions) charged (credited) to expense	(401)	1,521	(1,083)
Balance at End of Year	$ 2,077	$ 2,478	$ 957