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Commitments and Contingencies Loss Contingencies (Details)
$ in Thousands
 1 Months Ended 7 Months Ended
Jan. 31, 2012
USD ($)
Jun. 30, 2010
Jul. 31, 2009
USD ($)
Jan. 31, 2008
officers
Feb. 28, 2009
counts
Materially Misstated Financial Statements          
Loss Contingencies          
Number of officers | officers       2  
Officer, Flood | Criminal | Materially Misstated Financial Statements          
Loss Contingencies          
Loss contingency, number of convicted counts | counts         9
Prison sentence, years   4 years      
Probation, in years   3 years      
Loss contingency, legal fees incurred $ 373   $ 373    
Loss contingency, legal fees, paid in escrow     248    
Loss contingency, damages paid, value     3,630    
Loss contingency, legal fees, refunded from escrow $ 248        
Officer, Strohm | Criminal | Materially Misstated Financial Statements          
Loss Contingencies          
Loss contingency, number of convicted counts | counts         1
Probation, in years   2 years      
Probation sentence, in hours   150 hours      
Flood [Member] | Counterclaims [Member]          
Loss Contingencies          
Gain contingency, unrecorded amount     $ 3,390