XML 77 R56.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Employee Compensation (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2014
shares
Dec. 31, 2016
USD ($)
plan
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock-based compensation plans | plan   2      
Maximum number of award to be granted per individual   500,000      
Maximum aggregate number of shares available under the employee stock purchase plan   1,300,000      
Purchase price for each share of common stock as percentage of the average of the market price   85.00%      
Shares of common stock issued under the ESPP plan   42,347 28,724 26,921  
Weighted-average price of shares of common stock issued under the ESPP plan | $ / shares   $ 65.48 $ 72.52 $ 52.08  
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum value of awards that can be granted to participant in any fiscal year | $   $ 500,000      
Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Quarterly issuance of common stock to Chief Executive Officer (shares) 10,086        
Annually issuance of common stock to Chief Executive Officer (shares)       20,172  
Upper Limit          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum expiry period for options   10 years      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares   200.00%      
Number of target performance shares issued (Shares)   132,228      
Stock Option | Lower Limit          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares   200.00%   200.00%  
Number of target performance shares issued (Shares)   182,464   63,771  
Minimum actual number of shares underlying each performance share award as a percentage of target performance shares       0.00%  
Actual payout as percentage of target for performance shares issued in period         165.00%
2008 Equity Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares authorized for issuance under stock-based compensation plans   14,000,000