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Stock Based Compensation Stock Incentive Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Apr. 21, 2000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 18.48 $ 18.48 $ 18.48        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 5,174,190       0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 1,003,275            
PerformanceStock​Plan [Member]              
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue 10.23 9.03 8.71 8.62      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0 $ 0 $ 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod​Weighted​Average​Grant​Date​Fair​Value 0 0 0.00        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 6.39 $ 5.55 $ 16.76        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 10.52 $ 9.78 $ 9.75        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 1,003,275 1,602,214 1,928,631 2,371,287      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0 0        
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod 4,000 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod (4,000) 0 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 506,422 208,889 277,009        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (92,517) (117,528) (165,647)        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 1,003,275 1,594,214 1,903,213 2,295,852      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​InPeriod​Prior​Year​Awards​Issued​Granted​InCurrent​Year 0 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Vested​InPeriod​Awarded​Shares (506,422) (208,889) (277,009)        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Awarded​Shares (88,517) (100,110) (115,630)        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 0 8,000 25,418 75,435      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod 0 0 0        
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded 0 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Not​Yet​Awarded​Shares (4,000) (17,418) (50,017)        
Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 972,099 481,166 422,572 3,719,974   187,040  
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue 29.96 28.74 28.19   27.96    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.52 $ 32 $ 31.02        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod​Weighted​Average​Grant​Date​Fair​Value 25 0 0.00        
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​GrantedShares​Awarded​InPeriod 0   0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 27 $ 0 $ 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 25.34 $ 26.32 $ 27.41        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 6,128,056 6,276,972 6,659,047   6,606,101    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 972,099 481,166 422,572        
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod 1,431,319 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod (1,431,319) 0 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 166,884 0 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (954,131) (863,241) (369,626)        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 2,401,294 1,129,994 1,060,890   995,717    
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​InPeriod​Prior​Year​Awards​Issued​Granted​InCurrent​Year 182,653 164,646 113,088        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Vested​InPeriod​Awarded​Shares 166,884 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Awarded​Shares (175,788) (95,542) (47,915)        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 3,726,762 5,146,978 5,598,157   5,610,384    
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod 789,446 316,520 309,484        
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded 0 0 0        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Not​Yet​Awarded​Shares (778,343) (767,699) (321,711)        
Incentive Stock Option Plan [Member] | Maximum [Member]              
Shares held in Employee Stock Option Plan, Suspense Shares             4,800,000
Eighteen​Point​Four​Eight​Exercise​Price [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 18.48