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Income Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 $ 60,482 $ 56,813 $ 52,271
Additions based on tax positions related to the current year 4,220 6,896 7,606
Reductions due to lapse of applicable statutes of limitation (3,962) (3,227) (3,064)
Gross balance at December 31 60,740 60,482 56,813
Interest and penalties 4,912 5,125 5,756
Balance at December 31 $ 65,652 $ 65,607 $ 62,569