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Income Tax Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Uncertainties [Abstract]      
Net interest and penalties expense $ 206 $ 99  
Accrued interest 2,730   $ 2,473
Accrued penalties 2,432   2,329
Unrecognized tax benefits related to uncertain tax positions 59,358   57,626
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate $ 58,101   $ 56,411