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Stockholders' Equity (Details) (Restricted Stock [Member], USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock [Member]
 
Summary of restricted stock unit activity  
Number of Units outstanding, beginning of year 582,212
Weighted Average Grant-Date Fair Value, beginning of year $ 5.42
Granted, Number of Units 576,376
Granted, Weighted Average Grant-Date Fair Value $ 8.92
Released, Number of Units (123,501)
Released, Weighted Average Grant-Date Fair Value $ 5.28
Forfeited, Number of Units (14,126)
Forfeited, Weighted Average Grant-Date Fair Value $ 5.30
Number of Units outstanding, end of year 1,020,961
Weighted Average Grant-Date Fair Value, end of year $ 7.41
Aggregate Intrinsic Value at Year End $ 8,116,640