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Income Taxes (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Reversal of uncertain tax positions $ 191 $ 170  
Liability for uncertain tax positions 1,435   $ 1,419
Reduction to deferred tax assets 636   $ 560
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations, including interest and penalties 18    
Excess tax benefits $ 485