Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Awards Stock-Based Awards (Summary of Stock-Based Awards Granted) (Details)

v3.2.0.727
Stock-Based Awards Stock-Based Awards (Summary of Stock-Based Awards Granted) (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Stock appreciation rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 508,420
Weighted Average per Share Fair Value $ 13.65
Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 215,712
Weighted Average per Share Fair Value $ 66.18
Employee stock purchase plan options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 18,428
Weighted Average per Share Fair Value $ 15.45
Stock appreciation rights and stock options due to special dividend  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 343,485
Restricted stock unit dividend equivalents due to special dividend and quarterly dividends  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 97,979
Market stock units related to special dividend  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 15,078