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Stock-Based Compensation Performance Share Units Activity (Details)
6 Months Ended
Jun. 30, 2018
$ / 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 252,815
Granted (shares) | shares 54,059 [1]
Vested (shares) | shares (36,920)
Forfeited (shares) | shares (139,628)
Outstanding and nonvested, shares, end of period (shares) | shares 129,604
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 $ 22.53
Granted, weighted average fair value (usd per share) | $ / shares 42.40 [1]
Vested, weighted average fair value (usd per share) | $ / shares 38.67
Forfeited, weighted average fair value (usd per share) | $ / shares 13.25
Outstanding and nonvested, weighted average fair value, end of period (usd per share) | $ / shares $ 36.20
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 2,189
Vested (shares) | shares (2,680)
Forfeited (shares) | shares (231)
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 $ 38.28
Vested, weighted average fair value (usd per share) | $ / shares 35.20
Forfeited, weighted average fair value (usd per share) | $ / shares $ 35.24
[1] Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.