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Stock-Based Compensation Performance Share Units Activity (Details)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
PSU  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding, shares, beginning of period (shares) | shares 161,515
Granted (shares) | shares 49,342 [1]
Vested (shares) | shares (119,282)
Outstanding and nonvested, shares, end of period (shares) | shares 86,514
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Outstanding, weighted average fair value, beginning of period (usd per share) | $ / shares $ 37.30
Granted, weighted average fair value (usd per share) | $ / shares 46.43 [1]
Vested, weighted average fair value (usd per share) | $ / shares 36.60
Outstanding and nonvested, weighted average fair value, end of period (usd per share) | $ / shares $ 42.06
PSU Dividend Equivalent Unit (DEU)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Granted (shares) | shares 1,487
Vested (shares) | shares (6,548)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Granted, weighted average fair value (usd per share) | $ / shares $ 40.95
Vested, weighted average fair value (usd per share) | $ / shares $ 37.19
[1] Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.