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Stock-Based Compensation Performance-Based Restricted Stock Units (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 4,520 $ 2,618 $ 4,609
Performance-Based Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance at (in shares) 1,224 1,399 150
Granted (in shares)     2,097
Vested (in shares)     (40)
Forfeited (in shares) (8) (175) (698)
Shares not vesting due to Performance (in shares) (1,216)   (110)
Balance at (in shares) 0 1,224 1,399
Balance at, Weighted Average Grant Date Fair Value (usd per share) $ 4.54 $ 4.55 $ 4.47
Granted, Weighted Average Grant Date Fair Value (usd per share)     $ 4.56
Vested, Weighted Average Grant Date Fair Value (usd per share)     $ 4.47
Forfeited, Weighted Average Grant Date Fair Value (usd per share) $ 4.59 $ 4.59 $ 4.59
Shares not vesting due to Performance, Weighted Average Grant Date Fair Value (usd per share) $ 4.54   $ 4.47
Balance at, Weighted Average Grant Date Fair Value (usd per share) $ 0 $ 4.54 $ 4.55
Compensation expense   $ (161) $ 184
Percentage of compensation granted for goals not reached 0.00%    
Percentage of compensation granted for maximum performance 200.00%    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period minimum (in years) 2 years    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period minimum (in years) 3 years