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Share-Based Compensation - Summary of Additional Information on Stock Options (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Total intrinsic value of stock options outstanding $ 740 $ 2,251 $ 2,723
Total intrinsic value of stock options exercised 1,474 1,616 1,611
Fair value of stock options vested 0 0 532
Cash received from the exercise of stock options 898 1,155 777
Tax benefits realized for tax deductions related to stock option exercises $ 104 $ 461 $ 404