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Stockholders' Equity and Equity Compensation - Financial Data for Stock Option Exercises (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 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 0 315
Aggregate intrinsic value of outstanding stock options 478 102
Aggregate intrinsic value of exercisable stock options $ 478 $ 102