XML 80 R60.htm IDEA: XBRL DOCUMENT v3.8.0.1
STOCK PLANS (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based Compensation arrangement by Share-based payment award, equity instruments others than options, vested and expected to vest, weighted average grant date fair value $ 47.32      
share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and expected to vest, aggregate intrinsic value $ 22,804      
Stock options        
Number of Shares        
Balance at the beginning of the period (in shares) 5,207,743 4,645,722 4,677,856  
Granted (in shares) 1,072,625 1,656,598 906,706  
Exercised (in shares) (539,989) (518,226) (618,434)  
Forfeited (in shares) (555,897) (401,048) (294,880)  
Expired (in shares) (232,989) (175,303) (25,526)  
Balance at the end of the period (in shares) 4,951,493 5,207,743 4,645,722 4,677,856
Exercisable at the end of the period (in shares) 2,882,384      
Vested and expected to vest at the end of the period (in shares) 4,951,493      
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 42.16 $ 44.03 $ 35.78  
Granted (in dollars per share) 43.93 38.20 75.35  
Exercised (in dollars per share) 12.55 11.13 16.29  
Forfeited (in dollars per share) 48.66 70.27 64.29  
Expired (in dollars per share) 74.65 80.91 81.94  
Balance at the end of the period (in dollars per share) 43.51 $ 42.16 $ 44.03 $ 35.78
Exercisable at the end of the period (in dollars per share) 42.20      
Vested and expected to vest at the end of the period (in dollars per share) $ 43.51      
Weighted Average remaining contractual term        
Balance at the end of the period 6 years 10 months 27 days 7 years 4 months 22 days 7 years 3 months 22 days 7 years 10 months 11 days
Exercisable at the end of the period 5 years 6 months 2 days      
Vested and expected to vest at the end of the period 6 years 10 months 27 days      
Aggregate intrinsic value        
Balance at the beginning of the period (in dollars) $ 37,581 $ 162,340 $ 248,276  
Exercised (in dollars) 15,865 21,750 39,401  
Balance at the end of the period (in dollars) 57,021 $ 37,581 $ 162,340 $ 248,276
Exercisable at the end of the period (in dollars) 47,082      
Vested and expected to vest at the end of the period (in dollars) $ 57,021      
Weighted average assumptions used to estimate the fair values of each option grant        
Risk free interest rate, minimum (as a percent) 1.68% 1.03% 1.40%  
Risk free interest rate, maximum (as a percent) 2.42% 2.48% 2.28%  
Expected volatility (as a percent) 51.40% 53.50% 52.90%  
Expected life of options 5 years 3 months 21 days 5 years 9 months 6 days 5 years 9 months 3 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 20.78 $ 19.13 $ 37.82  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 364,403 216,198 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 343,583 256,631 232,046  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (101,379) (61,487) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (107,061) (46,939) (15,848)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 499,546 364,403 216,198 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 52.85 $ 78.59 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 44.23 40.21 78.65  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 53.76 78.33 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 49.98 68.84 79.43  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 47.32 $ 52.85 $ 78.59 $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 22,804 $ 11,824 $ 16,602 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest 499,546,000      
Stock options        
Weighted average assumptions used to estimate the fair values of each option grant        
Expected volatility (as a percent) 53.80% 63.40% 50.70%  
Expected life of options 6 months 6 months 6 months  
Stock options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.80 $ 10.57 $ 21.93  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.62% 0.37% 0.13%  
Stock options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 13.85 $ 25.28 $ 25.24  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.14% 0.49% 0.11%