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Share-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 1,500,000 $ 1,800,000    
Share-based compensation expense, income tax benefit 400,000 500,000    
Unrecognized share-based compensation expense $ 22,200,000      
Unrecognized share-based compensation expense, vest over weighted-average period 2 years 6 months      
Stock options granted 196,000      
RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation award, vesting period 3 years      
Share-based compensation $ 1,300,000 900,000    
Unrecognized share-based compensation expense $ 12,700,000      
Unrecognized share-based compensation expense, vest over weighted-average period 2 years 4 months 24 days      
Unrecognized share-based compensation expense, expected to vest, Shares 900,000      
Unrecognized share-based compensation expense, weighted-average grant date fair value $ 16.18      
Share-based compensation award, granted 514,000      
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation award, vesting period 4 years      
Share-based compensation $ 200,000 100,000    
Unrecognized share-based compensation expense $ 2,800,000      
Unrecognized share-based compensation expense, vest over weighted-average period 3 years 1 month 6 days      
Stock options granted 195,500      
Share-based compensation award, weighted-average grant date fair market value $ 4.67      
Intrinsic value of options exercised   1,000,000.0    
Stock options exercises 0      
Excess tax benefit on stock options exercises, shown as operating cash inflows   0    
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 300,000 $ 600,000    
Unrecognized share-based compensation expense $ 800,000      
Unrecognized share-based compensation expense, vest over weighted-average period 8 months 12 days      
Share-based compensation award, granted 0 0    
Share-based compensation expense, targeted performance percentage 95.00%      
Share-based compensation expense, actual performance percentage 100.00%      
Maximum payout for awards       156,169
Restricted Stock | Share-based Compensation Award, Tranche One        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards vesting period 50.00%      
Restricted Stock | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Potential payout for awards 129,400      
Restricted Stock | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Potential payout for awards 0      
Performance Share Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation   $ 200,000    
Unrecognized share-based compensation expense $ 5,900,000      
Unrecognized share-based compensation expense, vest over weighted-average period 2 years 8 months 12 days      
Share-based compensation award, granted 329,000      
Share-based compensation expense, targeted performance percentage 100.00% 48.00% 95.00%  
Reversal of share-based compensation expense $ 300,000      
Performance Share Units | Certain Executive Officers And Senior Management        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation award, granted 329,400      
Share-based compensation award, granted, net of forfeitures 329,400 105,696 28,880  
Performance Share Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Potential payout for awards 497,800      
Performance Share Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Potential payout for awards 0      
2016 PIP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock reserved and authorized 3,500,000      
Shares authorized and available for grant 0      
2019 Awards | Performance Share Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Distribution of common stock 75.00%