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Stockholders' Equity (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee and non-employee stock option exercise data        
Number of options exercised (in shares) 310,673 246,401 665,363 386,515
Cash received $ 9,799 $ 6,575 $ 19,896 $ 9,689