Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v3.8.0.1
Stock-Based Compensation (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested Beginning balance Number of shares | shares 104
Granted, Number of shares | shares 74
Vested, Number of shares | shares (46)
Forfeitures, Number of shares | shares (3)
Nonvested Ending balance Number of shares | shares 129
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Nonvested Beginning balance, Weighted average grant-date fair value | $ / shares $ 32.42
Granted, Weighted average grant-date fair value | $ / shares 35.45
Vested, Weighted average grant-date fair value | $ / shares 33.30
Forfeitures, Weighted average grant-date fair value | $ / shares 31.85
Nonvested Ending balance, Weighted average grant-date fair value | $ / shares $ 33.99