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Share-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 15, 2017
Aug. 11, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Other long-term obligations     $ 11,019 $ 5,420 $ 11,019 $ 5,420 $ 3,771
Selling, General and Administrative Expenses              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation cost related to stock options and RSUs recognized     $ 583 517 $ 1,443 $ 1,266  
Market-Based RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate           1.20%  
Volatility           33.08%  
Dividend yield           2.99%  
RSUs granted during the period (in shares)         0    
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate         2.21% 1.66%  
Volatility         34.44% 35.12%  
Dividend yield         2.90% 2.91%  
Stock options granted during the period (in shares)         124,000 151,350  
Weighted average fair value of stock options granted (in dollars per share)         $ 7.40 $ 6.25  
Stock options outstanding (in shares)     600,200   600,200    
Total unrecognized compensation cost related to non-vested stock option awards     $ 1,617   $ 1,617    
Equity incentive plan, weighted average recognition period         2 years 8 months 4 days    
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
RSUs granted during the period (in shares)         88,680 66,602  
Weighted average fair value of restricted stock granted (in dollars per share)         $ 25.42 $ 21.47  
RSUs outstanding (in shares)     209,205   209,205    
Equity incentive plan, weighted average recognition period         2 years 4 months 17 days    
Total unrecognized compensation cost related to non-vested RSUs     $ 2,502   $ 2,502    
RSUs | Board of Directors Chairman              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
RSUs granted during the period (in shares)   10,000          
Lump sum cash payment of RSUs converted $ 266            
Other long-term obligations       $ 186   $ 186 $ 210
2013 Equity Compensation Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of grant         10 years    
Shares available for grant (in shares)     517,368   517,368    
2013 Equity Compensation Plan | Service-Based Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         25.00%    
Award service period         1 year    
Third Anniversary | 2013 Equity Compensation Plan | Service-Based RSUs | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         50.00%    
Fourth Anniversary | 2013 Equity Compensation Plan | Service-Based RSUs | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         50.00%