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Common Stock and Share-Based Compensation - Performance Stock Activity (Details) - PSUs
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
PSUs  
Outstanding balance at beginning of period (shares) | shares 121,807
Granted (shares) | shares 290,609
Vested (shares) | shares 0
Forfeited or canceled (shares) | shares (21,870)
Performance adjustment (shares) | shares (85,795)
Outstanding balance at end of period (shares) | shares 304,751
Weighted Average Grant Date Fair Value  
Outstanding balance at beginning of period (USD per share) | $ / shares $ 18.62
Granted (USD per share) | $ / shares 8.79
Vested (USD per share) | $ / shares 0.00
Forfeited or canceled (USD per share) | $ / shares 10.98
Performance adjustment (USD per share) | $ / shares 18.13
Outstanding balance at end of period (USD per share) | $ / shares $ 9.93
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rate (as a percent) 0.00%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rate (as a percent) 200.00%