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Stock Based Compensation Schedule of Share Based Compensation, Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Apr. 28, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     5,174,190       0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Awarded​Shares​Outstanding​Number     1,003,275              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     175,000 269,589 470,356 622,945        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 18.48 $ 18.48 $ 18.57 $ 18.39        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     1 year 2 months 2 years 2 months 3 years 1 month 4 years 1 month        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 4,616 $ 2,395 $ 5,087 $ 7,289        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     0 0 0          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0 $ 0 $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     (64,589) (151,767) (106,589)          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price     $ 18.48 $ 18.48 $ 18.48          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period     (30,000) (49,000) (46,000)          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price     $ 18.48 $ 19.36 $ 18          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period     0 0 0          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price     $ 0 $ 0 $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number     175,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price     $ 18.48              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     1 year 2 months              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     $ 4,616              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     175,000 164,589 316,356          
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, Exercisable, Weighted Average Remaining Contractual Term     1 year 2 months 2 years 2 months 3 years 2 months          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 4,616 $ 2,241 $ 4,565          
Stock Issued During Period, Shares, Share-based Compensation, Gross             12,610      
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​Not​Yet​Awarded​InPeriod     (1,431,319) 0 0          
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  
Shares​Available​For​Issuance​Under​Stock​Incentive​Plan                   6,046,768
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, 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​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​Shares​Not​Yet​Awarded​Outstanding​Number     3,726,762 5,146,978 5,598,157   5,610,384      
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 by Share-based Payment Award, Options, Vested, Number of Shares     182,653 164,646 113,088 891,399        
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod     789,446 316,520 309,484          
Stock Issued During Period, Shares, Share-based Compensation, Gross 12,627 11,682 16,860 15,700 9,870     36,919    
PerformanceStock​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​Not​Yet​Awarded​InPeriod     (4,000) 0 0          
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, Weighted Average Grant Date Fair Value     $ 0 $ 0 $ 0          
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​Shares​Not​Yet​Awarded​Outstanding​Number     0 8,000 25,418 75,435        
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​Grants​Not​Yet​Awarded​InPeriod     0 0 0          
Minimum [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​Options​Vesting​Period     5 years 5 years 3 years 3 years        
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​Not​Yet​Awarded​InPeriod     1,435,319 0 0          
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod     789,446 316,520 309,484