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Common Stock and Share-Based Compensation - Restricted Stock Activity (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
PSUs  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at beginning of period (shares) | shares 121,807
Granted (shares) | shares 295,191
Forfeited (shares) | shares (39,430)
Performance adjustment (shares) | shares (85,795)
Outstanding at end of period (shares) | shares 291,773
Weighted-Average Grant Date Fair Value  
Outstanding at beginning of period (USD per share) | $ / shares $ 18.62
Granted (USD per share) | $ / shares 8.80
Forfeited (USD per share) | $ / shares 10.38
Performance adjustment (USD per share) | $ / shares 18.13
Outstanding at end of period (USD per share) | $ / shares $ 9.94
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at beginning of period (shares) | shares 52,769
Granted (shares) | shares 102,485
Vested (shares) | shares (67,728)
Outstanding at end of period (shares) | shares 87,526
Weighted-Average Grant Date Fair Value  
Outstanding at beginning of period (USD per share) | $ / shares $ 14.97
Granted (USD per share) | $ / shares 6.99
Vested (USD per share) | $ / shares 11.33
Outstanding at end of period (USD per share) | $ / shares $ 8.44