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Long-Term Incentive Program Long-Term Incentive Program (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested - December 31, 2015 | $ / shares $ 52.80
Granted | $ / shares 59.13
Vested | $ / shares 0.00
Canceled | $ / shares 52.80
Unvested - June 30, 2016 | $ / shares $ 56.26
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested - December 31, 2015 183,401
Granted 237,050
Vested 0
Canceled (4,635)
Unvested - June 30, 2016 415,816
2015 LTIP Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unamortized compensation expense | $ $ 5.4
Estimate of shares expected to vest 178,770
2016LTIPAwards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unamortized compensation expense | $ $ 6.0
Estimate of shares expected to vest 127,429
Target [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested - December 31, 2015 100,900
Granted 118,525
Vested 0
Canceled (2,550)
Unvested - June 30, 2016 216,875