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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 30, 2019
Mar. 31, 2019
Jul. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2019
Jul. 30, 2018
Number of Shares                          
Granted (in shares)               229,344          
SARS exercised, shares               (43,594)          
Forfeited (in shares)               (22,977)          
Weighted Average Exercise Price                          
Options vested, outstanding (in shares)               1,458,484          
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares               449,736          
Weighted Average Exercise Price Per Share (in dollars per share)               $ 16.44          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms               6 years 3 months 29 days          
Number of exercisable options (in shares)               1,458,484          
Weighted average exercise price per share (in dollars per share)               $ 15.33          
Unvested activity                          
Granted (in shares)               277,307          
Nonvested at the end of the period (in shares)               465,584 494,882        
Weighted Average Grant Date Fair Value                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period               (70,391)          
$7.00-$13.70                          
Weighted Average Exercise Price                          
Options vested, outstanding (in shares)               624,693          
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares               83,654          
Weighted Average Exercise Price Per Share (in dollars per share)               $ 9.42          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms               6 years 7 months 24 days          
Number of exercisable options (in shares)               624,693          
Weighted average exercise price per share (in dollars per share)               $ 8.85          
$16.53 - $22.70                          
Weighted Average Exercise Price                          
Options vested, outstanding (in shares)               584,950          
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares               361,000          
Weighted Average Exercise Price Per Share (in dollars per share)               $ 19.45          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms               6 years 7 months 6 days          
Number of exercisable options (in shares)               584,950          
Weighted average exercise price per share (in dollars per share)               $ 18.23          
$23.03 - $26.92                          
Weighted Average Exercise Price                          
Options vested, outstanding (in shares)               248,841          
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares               5,082          
Weighted Average Exercise Price Per Share (in dollars per share)               $ 24.78          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms               4 years 5 months 12 days          
Number of exercisable options (in shares)               248,841          
Weighted average exercise price per share (in dollars per share)               $ 24.79          
Stock options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)           3 years              
Weighted Average Exercise Price                          
Recognized stock-based compensation expense             $ 0       $ 0    
Unrecognized stock-based compensation expense                 $ 0        
Weighted Average Grant Date Fair Value                          
Stock options exercised             0       0    
Proceeds from Stock Options Exercised             $ 0       $ 0    
Stock options | Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expiration period (in years)           7 years              
Stock Appreciation Rights (SARs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Exercise Price               $ 15.87          
Fair value assumptions                          
Risk-free interest rate (as a percent) 1.84% 2.52% 2.87% 2.69% 2.17%                
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00%                
Expected life 6 years 6 years 6 years 6 years 6 years                
Volatility (as a percent) 47.10% 46.20% 44.70% 44.60% 43.90%                
SAR grant price (usd per share)   $ 22.51   $ 19.80 $ 13.70 $ 22.51 $ 19.80         $ 27.39 $ 24.65
Number of Shares                          
Outstanding at beginning of period (in shares)           1,745,447   1,745,447          
Outstanding at end of period (in shares)               1,908,220 1,745,447        
Weighted Average Exercise Price                          
Outstanding at beginning of period (usd per share)           $ 15.73   $ 15.73          
Granted (usd per share)               22.79          
Forfeited/expired (usd per share)               26.94          
Outstanding at end of period               $ 16.44 $ 15.73        
Outstanding - Aggregate Intrinsic Value               $ 13,000,000.0 $ 8,900,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised               300,000 500,000   $ 0    
Recognized stock-based compensation expense               1,900,000 $ 1,800,000 $ 1,900,000      
Unrecognized stock-based compensation expense               $ 2,400,000          
Unrecognized stock-based compensation expense, period of recognition               1 year 9 months 18 days          
Unvested activity                          
Granted (in shares)               229,344          
Nonvested at the end of the period (in shares)               449,736 467,478        
Weighted Average Grant Date Fair Value                          
Nonvested at the beginning of the period (in dollars per share)           $ 6.65   $ 6.65          
Granted (in dollars per share) $ 12.80 $ 10.62 $ 11.48 $ 9.16 $ 6.13     10.75          
Vested (in dollars per share)               5.17          
Forfeited (in dollars per share)               12.80          
Nonvested at the end of the period (in dollars per share)               $ 9.32 $ 6.65        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               (233,842)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period               (13,244)          
Stock Appreciation Rights (SARs) | Minimum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)           3 years              
Stock Appreciation Rights (SARs) | $7.00-$13.70                          
Weighted Average Exercise Price                          
Range of Exercisable Prices, low end of range (in dollars per share)           $ 7              
Range of Exercisable Prices, high end of range (in dollars per share)           13.70              
Stock Appreciation Rights (SARs) | $16.53 - $22.70                          
Weighted Average Exercise Price                          
Range of Exercisable Prices, low end of range (in dollars per share)           16.53              
Range of Exercisable Prices, high end of range (in dollars per share)           22.70              
Stock Appreciation Rights (SARs) | $23.03 - $26.92                          
Weighted Average Exercise Price                          
Range of Exercisable Prices, low end of range (in dollars per share)           23.03              
Range of Exercisable Prices, high end of range (in dollars per share)           $ 26.92              
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expiration period (in years)           10 years              
Unvested activity                          
Granted (in shares) 13,244 216,100 7,622 221,818 266,540                
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs) | Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)           5 years