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Stockholders' Equity, Restricted Stock Units (Details) (USD $)
6 Months Ended 3 Months Ended
Jun. 30, 2013
Restricted Stock Units ("RSUs") [Member]
Jun. 30, 2013
Restricted Stock Units ("RSUs") [Member]
Non-employee directors [Member]
Mar. 31, 2013
Time-based RSUs [Member]
Key executives [Member]
Mar. 31, 2013
Performance-based RSUs [Member]
Key executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units, granted (in shares)   48,851 249,750 399,750
Weighted average fair market value on grant date - May 23, 2012 (in dollars per share)   $ 4.70    
Vesting period   1 year 3 years 3 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Unrecognized compensation cost related to restricted stock units $ 1,700,000      
Nonvested awards, unrecognized cost, period for recognition 2 years 0 months 18 days