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Debt (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Senior Secured Notes [Member]
Mar. 31, 2012
Senior Secured Notes [Member]
Apr. 30, 2010
Senior Secured Notes [Member]
Jun. 30, 2012
Senior Secured Notes [Member]
Jun. 30, 2011
Senior Secured Notes [Member]
Debt Instrument [Line Items]            
Principal amount of notes issued       $ 200,000   $ 52,000
Notes issued specified as percentage of principal amount (in hundredths)       97.266% 103.00%  
Interest rate of notes (in hundredths)       11.75%    
Maturity date of notes   May 01, 2015        
Issuance cost of notes 154     9,015 1,528  
Interest expense   8,139 8,051      
Amortization of notes issuance costs   554 487      
Amortization of net debt discount   $ 182 $ 160