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Stock-based and Deferred Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
executive_officers_and_management_members
Dec. 31, 2011
Aug. 13, 2012
Subsequent event [Member]
Chief Executive Officer [Member]
Sep. 30, 2012
Subsequent event [Member]
Chief Executive Officer [Member]
General and administrative [Member]
May 10, 2012
Equity Plan 2007 [Member]
Jun. 30, 2012
Equity Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Aggregate amount loaned to current and former executive oficers and other members of management $ 0.4 $ 0.9            
Number of named executive officers who repaid their entire restricted stock loan balances     3          
Due from officers and management members recorded in additional paid-in capital 6.0     7.2        
Additional shares authorized for issuance of stock options and restricted stock under the equity plan             850,000  
Total shares authorized under the equity plan               13,200,000
Accelerated bonus payment as a result of completion of IPO         22.4      
Accelerated bonus expense           $ 18.1