Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Stock-Based Awards Stock-Based Awards (Summary of Stock-Based Awards Granted) (Details)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Stock appreciation rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 928,990
Weighted Average per Share Fair Value | $ / shares $ 7.31
Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 258,676
Weighted Average per Share Fair Value | $ / shares $ 45.54
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 92,290
Weighted Average per Share Fair Value | $ / shares $ 54.06
Employee stock purchase plan options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 29,965
Weighted Average per Share Fair Value | $ / shares $ 12.18
Dividend equivalents due to quarterly dividend  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted 9,394