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Stock Based Compensation Stock Incentive Plan (Details) - $ / shares
12 Months Ended
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 5,266,707     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 1,594,214          
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 8,000          
PerformanceStock​Plan [Member]            
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue 9.03 8.71 8.62 8.72    
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 10.25      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 5.55 $ 16.76 $ 4.01      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 9.78 $ 9.75 $ 8.73      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 1,602,214 1,928,631 2,371,287 3,691,022    
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 0 0 122,021      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod 0 0 (122,021)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 208,889 277,009 119,364      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (117,528) (165,647) (1,200,371)      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 1,594,214 1,903,213 2,295,852 2,394,505    
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 (208,889) (277,009) (119,364)      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Awarded​Shares (100,110) (115,630) (101,310)      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 8,000 25,418 75,435 1,296,517    
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 (17,418) (50,017) (1,099,061)      
Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 481,166 422,572 3,719,974   187,040  
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue 28.74 28.19 27.96 22.91    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 31.74 $ 31 $ 31.95      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod​Weighted​Average​Grant​Date​Fair​Value 0 0 30.71      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 0 $ 0 $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 26.32 $ 27.41 $ 23.88      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 6,276,972 6,659,047 6,606,101 3,157,311    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 481,166 422,572 3,719,974      
Share​Based​Compensation​Arrangement​BySharebased​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​InPeriod 0 0 966,215      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Not​Yet​Awarded​InPeriod 0 0 (966,215)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0 0 0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (863,241) (369,626) (271,184)      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number 1,129,994 1,060,890 995,717 37,408    
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​InPeriod​Prior​Year​Awards​Issued​Granted​InCurrent​Year 164,646 113,088 0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Vested​InPeriod​Awarded​Shares 0 0 0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Awarded​Shares (95,542) (47,915) (7,906)      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 5,146,978 5,598,157 5,610,384 3,119,903    
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod 316,520 309,484 3,719,974      
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded 0 0 0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Forfeited​InPeriod​Not​Yet​Awarded​Shares (767,699) (321,711) (263,278)      
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