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Stockholders' Equity - Stock Options By Exercise Price Range (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 0.49
Exercise Price Upper Range Limit $ 4,401.93
Number of Shares Outstanding 2,213
Weighted Average Remaining Contractual Life 2847 days
Weighted Average Exercise Price Per Share $ 13.51
Number of Shares Exercisable 976
Weighted Average Exercise Price, Options Exercisable $ 15.01
Range 1 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 0.49
Exercise Price Upper Range Limit $ 6.80
Number of Shares Outstanding 589
Weighted Average Remaining Contractual Life 2577 days
Weighted Average Exercise Price Per Share $ 5.52
Number of Shares Exercisable 263
Weighted Average Exercise Price, Options Exercisable $ 4.31
Range 2 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 6.95
Exercise Price Upper Range Limit $ 10.71
Number of Shares Outstanding 601
Weighted Average Remaining Contractual Life 3212 days
Weighted Average Exercise Price Per Share $ 9.72
Number of Shares Exercisable 164
Weighted Average Exercise Price, Options Exercisable $ 9.37
Range 3 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 10.85
Exercise Price Upper Range Limit $ 18.86
Number of Shares Outstanding 492
Weighted Average Remaining Contractual Life 2920 days
Weighted Average Exercise Price Per Share $ 15.74
Number of Shares Exercisable 247
Weighted Average Exercise Price, Options Exercisable $ 15.53
Range 4 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 19.40
Exercise Price Upper Range Limit $ 31.19
Number of Shares Outstanding 447
Weighted Average Remaining Contractual Life 2957 days
Weighted Average Exercise Price Per Share $ 21.60
Number of Shares Exercisable 218
Weighted Average Exercise Price, Options Exercisable $ 21.78
Range 5 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 33.57
Exercise Price Upper Range Limit $ 4,401.93
Number of Shares Outstanding 84
Weighted Average Remaining Contractual Life 1205 days
Weighted Average Exercise Price Per Share $ 40.56
Number of Shares Exercisable 84
Weighted Average Exercise Price, Options Exercisable $ 40.56