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Income Tax Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax Uncertainties [Abstract]          
Net interest and penalties expense (benefit) $ (746) $ 591 $ (334) $ 923  
Accrued interest 2,879   2,879   $ 2,473
Accrued penalties 2,412   2,412   2,329
Unrecognized tax benefits related to uncertain tax positions 63,707   63,707   57,626
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate $ 62,335   $ 62,335   $ 56,411