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Income Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 $ 61,649 $ 60,740 $ 60,482
Additions based on tax positions related to the current year 3,971 3,855 4,220
Reductions due to lapse of applicable statutes of limitation (3,332) (2,946) (3,962)
Gross balance at December 31 62,288 61,649 60,740
Interest and penalties 5,860 5,219 4,912
Balance at December 31 $ 68,148 $ 66,868 $ 65,652