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Stock Based Compensation Summary of PSP Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 847,238      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0 0  
Stock Incentive Plan [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue 31.16 29.96 28.74 28.19
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 6,410,995 6,128,056 6,276,972 6,659,047
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 2,404,802 2,401,294 1,129,994 1,060,890
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 4,006,193 3,726,762 5,146,978 5,598,157
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 41.65 $ 35.52 $ 31.74  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 696,456 972,099 481,166  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​InPeriod​Prior​Year​Awards​Issued​Granted​InCurrent​Year 120,667 182,653 164,646  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod     316,520  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod​Weighted​Average​Grant​Date​Fair​Value 31.44 24.93 0  
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​GrantedShares​Awarded​InPeriod 0 0 0  
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod 163,404 1,431,319 0  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod (163,404) (1,431,319) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 25.22 $ 27.31 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 242,457 166,884 0  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Vested​InPeriod​Awarded​Shares 242,457 (166,884) 0  
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded 0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 29.77 $ 25.34 $ 26.32  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (171,060) (954,131) (863,241)  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Awarded​Shares (38,106) (175,788) (95,542)  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Not​Yet​Awarded​Shares (132,954) (778,343) (767,699)  
Time-Based [Member] | Stock Incentive Plan [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 120,667 182,653 164,646  
Perfomance Based [Member] | Stock Incentive Plan [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod 575,789 789,446 316,520  
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod 163,404 1,435,319 0