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Stockholders' Equity Stockholders' Equity (Summary of unvested restricted stock awards) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2013
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested at beginning of year (in shares)     565,000 565,000
Awards (in shares) 25,000 38,200   63,000
Vestings (in shares)       (292,000)
Cancellations (in shares)       (13,000)
Unvested at end of year (in shares)       323,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Unvested at beginning of year     $ 5.81 $ 5.81
Awards       $ 19.78
Vestings       $ 5.50
Cancellations       $ 7.34
Unvested at beginning of year       $ 8.64
Aggregate grant date market value $ 500,000   $ 800,000  
Incremental award vesting percentage 20.00%      
Award vesting period (in years) 5 years   3 years  
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Allocated Share Based Compensation Due to Accelerated Vesting       $ 400,000