Annual report pursuant to Section 13 and 15(d)

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details)

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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
VALUATION AND QUALIFYING ACCOUNTS      
Balance at the beginning of Period $ 14,094 $ 12,278 $ 11,461
Charged to Costs and Expenses 10,113 11,197 10,388
Net (Deductions) Recoveries 10,571 (9,381) (9,571)
Balance at the end of Period $ 13,636 $ 14,094 $ 12,278