Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Stock-Based Awards Stock-Based Awards (Summary of Stock-Based Awards Granted) (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
Rate
shares
Stock appreciation rights (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 1,144,049
Weighted Average per Share Fair Value | $ / shares $ 6.36
Restricted stock units (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 291,420
Weighted Average per Share Fair Value | $ / shares $ 38.14
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 96,439
Weighted Average per Share Fair Value | $ / shares $ 57.36
Employee stock purchase plan options (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 31,729
Weighted Average per Share Fair Value | $ / shares $ 8.63
Dividend equivalents due to quarterly dividend (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 8,940
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | Rate 200.00%
Maximum [Member] | Stock appreciation rights (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | Rate 200.00%
Maximum [Member] | Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards Granted (in shares) 192,878
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | Rate 200.00%