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Share Based Awards (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Dec. 31, 2012
Employee Stock Option [Member]
Y
Dec. 31, 2012
Restricted Stock Units Award [Member]
Dec. 31, 2012
Restricted Stock Units Award [Member]
Y
Dec. 31, 2011
Restricted Stock Units Award [Member]
Dec. 31, 2012
Employee Option [Member]
Dec. 31, 2011
Employee Option [Member]
Dec. 31, 2012
Director Options [Member]
Dec. 31, 2011
Director Options [Member]
May 24, 2012
Performance Based Award [Member]
May 24, 2012
Performance Based Award [Member]
Executive Officer [Member]
May 24, 2012
Performance Based Award [Member]
Non Executive Employees [Member]
Dec. 31, 2012
Nineteen Ninety Eight Plan [Member]
Sep. 30, 1998
Nineteen Ninety Eight Plan [Member]
Dec. 31, 2012
Two Thousand Five Stock Options Plan [Member]
Oct. 31, 2005
Two Thousand Five Stock Options Plan [Member]
Share Based Awards (Textual) [Abstract]                                        
Common stock reserved                                   8,000,000   4,800,000
Expiration date of options under 1998 Plan                                 10 years   10 years  
Outstanding options under 1998 and 2005 plan 1,266,711   1,266,711   988,337                       40,000   1,226,711  
Shares available for future grants                           600,000         2,915,963  
Weighted-average grant date fair value per share of stock options     $ 8.37 $ 13.32                                
Annualized forfeiture rate for employee options                   6.20% 3.90% 0.00% 0.00%              
Options granted under 2005 plan     516,500                                  
Maximum number of options available under the equity incentive program                             220,000 380,000        
Stock compensation related to the performance based award       $ 419                                
Total unrecognized compensation costs           6,662 680 680                        
Stock option recognized over weighted average period (in years)           3.7   1.9                        
Fair value of options vested 1,641     1,767                                
Restricted units issued             77,899                          
Compensation expense $ 583 $ 804 $ 1,966   $ 2,465     $ 450 $ 394