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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Effective income tax rate 73.00% (19.00%)  
U.S. Federal statutory rate 35.00% 35.00%  
Excess tax benefits on share-based compensation $ 2,300 $ 1,900  
Deferred income taxes $ 9,575   $ 9,075