v3.3.1.900
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in valuation and qualifying accounts      
Balance at Beginning of Year $ 14,188 $ 13,237 $ 16,894
Charged to Costs and Expenses 6,712 7,242 7,662
Deductions (8,415) (6,291) (11,319)
Balance at End of Year $ 12,485 $ 14,188 $ 13,237