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Equity Incentive Plans - Company's Equity Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 4 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Feb. 27, 2019
Mar. 01, 2018
Feb. 27, 2018
Feb. 22, 2017
Apr. 09, 2018
Mar. 30, 2017
Apr. 13, 2016
Apr. 13, 2015
May 09, 2016
Jul. 31, 2016
Aug. 27, 2018
Aug. 22, 2018
Aug. 22, 2017
Sep. 12, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares granted                             672,500 944,000 1,035,000  
Number of shares vested during the period                             809,500 1,049,000 783,545  
Dividends on non-vested shares                             $ 0 $ 0 $ 0  
Share based compensation                             $ 8,072 $ 9,267 $ 4,166  
Number of options granted                             0 0 0  
Total unrecognised compensation cost relating to non-vested share option                             $ 189      
Total unrecognised compensation cost relating to restricted share awards                             $ 784      
Weighted average remaining term for non-vested share option awards                             1 year 3 months 11 days      
Weighted average remaining term for non-vested restricted share awards                             1 year 9 months 18 days      
Total fair value of shares vested during the period                             $ 10,745 $ 12,023 $ 3,580  
Number of shares unvested                             143,000 280,000 385,000 135,230
Directors And Officers                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares granted                           345,000        
Grant date fair value                           $ 4.94        
Number of shares vested during the period   40,000       305,000                        
Employees                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares granted         276,000                          
Grant date fair value         $ 10.51                          
Number of shares vested during the period                     276,000              
Employee Stock Option                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of options granted               104,250                    
Option exercise price               $ 27.5                    
Fair value assumptions - Expected term               5 years                    
Fair value assumptions - Expected volatility rate               59.274%                    
Fair value assumptions - Risk free interest rate               1.30%                    
Equity Incentive Plan 2015                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares reserved for issuance               280,000                    
Number of shares granted               135,230                    
Grant date fair value               $ 17.75                    
Number of shares vested during the period             135,230                      
Equity Incentive Plan 2016                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares reserved for issuance                 940,000                  
Number of shares granted                 690,000                  
Grant date fair value                 $ 3.75                  
Number of shares vested during the period   40,000               650,000                
Equity Incentive Plan 2017                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares reserved for issuance       950,000                            
Number of shares granted       944,000                            
Grant date fair value       $ 9.59                            
Number of shares vested during the period                       200,000 744,000          
Equity Incentive Plan 2018                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares reserved for issuance     700,000                              
Number of shares granted     396,500                              
Grant date fair value     $ 12.49                              
Equity Incentive Plan 2018 | Tranche One                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares vested during the period                     253,500              
Equity Incentive Plan 2018 | Tranche Three                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Vesting date                             Feb. 27, 2021      
Number of shares unvested                             71,500      
Equity Incentive Plan 2018 | Subsequent Event | Tranche Two                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares vested during the period 71,500