Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Stock Options (Narrative) (Details)

v2.4.0.8
Stock Options (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
May 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity Incentive Plan, shares authorized   4,000,000 2,000,000  
Increase of shares reserved   500,000    
Stock-based compensation $ 4,500 $ 24,262 $ 8,874 $ 1,587
Expected price volitility     22.36%  
Expected price volatility, Minimum   60.70%    
Expected price volatility, Maximum   62.60%    
Risk-free interest rate, minimum   0.40%    
Risk-free interest rate, maximum   0.50%    
Expected dividend yield   0.00%    
Weighted average remaining contractual life   3 years 10 months 24 days    
Exercise price, grant date fair value   $ 40.94 $ 53.74  
Options cancelled, weighted average grant date fair value   $ 44.51 $ 8.91  
Total intrinsic value of options exercised   12,500 74,500 9,500
Unvested number of shares   993,585 1,034,619  
Unvested, weighted average grant date fair value   $ 46.79 $ 9.82  
Unrecognized compensation cost   57,000    
Remaining vesting period   1 year 8 months 12 days    
Shares granted   388,131 336,750 325,000
Shares available for equity awards   3,600,000    
Restricted Stock [Member]
        
Unrecognized compensation cost   $ 21,100    
Remaining vesting period   4 years    
Shares granted   215,153    
Minimum [Member]
        
Expected option term   2 years 6 months    
Maximum [Member]
        
Expected option term   3 years 8 months 12 days