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Stockholders' Equity and Equity Compensation - Financial Data for Stock Option Exercises (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Equity [Abstract]      
Amount collected from stock option exercises $ 0 $ 306  
Total intrinsic value of stock option exercises 0 47  
Tax shortfall of stock option exercises recorded in additional paid-in-capital 0 $ 293  
Aggregate intrinsic value of outstanding stock options 349   $ 149
Aggregate intrinsic value of exercisable stock options $ 349   $ 149