XML 67 R56.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Compensation cost recognized $ 3,614,000 $ 2,809,000  
Allocated Share-based Compensation Expense 3,614,000 2,809,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]      
Compensation cost recognized 3,500,000 2,700,000  
Allocated Share-based Compensation Expense 3,500,000 $ 2,700,000  
Unrecognized compensation cost related to non-vested awards granted $ 35,500,000   $ 37,900,000
Restricted Stock [Member]      
Nonvested at January 1, 2017 705,015    
Shares, Granted 15,270    
Shares, Vested (13,031)    
Shares, Canceled 0    
Nonvested at March 31, 2017 707,254    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2017 $ 41.40    
Weighted-Average Grant-Date Fair Value, Granted 82.69    
Weighted-Average Grant-Date Fair Value, Vested 41.02    
Weighted-Average Grant-Date Fair Value, Canceled 0.00    
Weighted-Average Grant-Date Fair Value, Nonvested at March 31, 2017 $ 42.30    
Weighted-average period to recognize compensation cost (in years) 3 years 1 month 10 days    
Restricted Stock Units (RSUs) [Member]      
Nonvested at January 1, 2017 51,950    
Shares, Granted 7,100    
Shares, Vested (7,150)    
Shares, Canceled (2,680)    
Nonvested at March 31, 2017 49,220    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 35,901    
Weighted-average period to recognize compensation cost (in years) 3 years 7 months 10 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 15 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term 1 year 9 months 4 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 3,012,481    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 4,130,050