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Stockholders' Equity and Equity Compensation - Financial Data for Stock Option Exercises (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]    
Amount collected from stock option exercises $ 306 $ 1,299
Total intrinsic value of stock option exercises 47 273
Tax shortfall of stock option exercises recorded in additional paid-in-capital 293 100
Aggregate intrinsic value of outstanding stock options 149 744
Aggregate intrinsic value of exercisable stock options $ 149 $ 738