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Stock-Based Compensation Performance-Based Restricted Stock Units (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unearned compensation $ 13,000    
Compensation expense $ 1,712,000 $ 2,874,000 $ 3,194,000
Performance-Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of compensation granted for goals not reached 0.00%    
Percentage of compensation granted for maximum performance 200.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning balance (in shares) 52,000 83,000 62,000
Granted (in shares) 56,000 30,000 22,000
Forfeited (in shares) (23,000) (61,000) (1,000)
Ending balance (in shares) 85,000 52,000 83,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning balance, Weighted Average Grant Date Fair Value (usd per share) $ 17.33 $ 35.52 $ 38.50
Granted, Weighted Average Grant Date Fair Value (usd per share) 17.76 10.11 27.20
Forfeited, Weighted Average Grant Date Fair Value (usd per share) 26.81 38.50 38.50
Ending balance, Weighted Average Grant Date Fair Value (usd per share) $ 15.06 $ 17.33 $ 35.52
Shares expected to vest (in shares) 0    
Unearned compensation $ 0    
Compensation expense $ 0 $ (202,000) $ 104,000
Performance-Based Restricted Stock Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 2 years    
Performance-Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years