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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Period $ 15,194 $ 13,476 $ 7,354
Additions (Deductions) Charged 6,907 4,793 8,917
Deductions from Reserves 7,055 3,075 2,795
Balance End of Period 15,046 15,194 13,476
Revenue Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Period 16,232 12,185 10,752
Additions (Deductions) Charged 24,252 28,312 20,237
Deductions from Reserves 26,281 24,265 18,804
Balance End of Period 14,203 16,232 12,185
Valuation Allowance on Deferred Tax Assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Period 30,916 29,061 29,726
Additions (Deductions) Charged 22,564 2,274 (1,812)
Deductions from Reserves 1,709 (419) 1,147
Balance End of Period $ 55,189 $ 30,916 $ 29,061