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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts receivable      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 33,133 $ 35,087 $ 30,544
Charged to Expenses 8,022 9,192 12,005
Deductions (8,751) (9,907) (5,353)
Translation Adjustments 777 (1,239) (2,109)
Balance at End of Period 33,181 33,133 35,087
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 18,907 26,329 29,561
Charged to Expenses 1,411 2,160 6,283
Deductions (1,275) (9,517) (8,068)
Translation Adjustments 1,135 (65) (1,447)
Balance at End of Period $ 20,178 $ 18,907 $ 26,329