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Stock Based Compensation Schedule of Share Based Compensation, Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 5,156,954          
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, Options, Outstanding, Number 0 175,000 269,589 470,356    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 0 $ 18.48 $ 18.48 $ 18.57    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   1 year 2 months 12 days 2 years 2 months 12 days 3 years 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0 $ 4,616 $ 2,395 $ 5,087    
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 (175,000) (64,589) (151,767)      
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 0 (30,000) (49,000)      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 0 $ 18.48 $ 19.36      
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 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0 175,000 164,589      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 0 $ 18.48 $ 18.48      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   1 year 2 months 12 days 2 years 2 months 12 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 0 $ 4,616 $ 2,241      
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 (163,404) (1,431,319) 0      
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 6,410,995 6,128,056 6,276,972   6,659,047  
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​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 696,456 972,099 481,166      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod     316,520      
Stock Issued During Period, Shares, Share-based Compensation, Gross   16,860 15,700 11,350    
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 0 (4,000) 0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Granted​Shares​Outstanding​Number 847,238 1,003,275 1,602,214 1,928,631    
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 847,238 1,003,275 1,594,214 1,903,213    
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Shares​Not​Yet​Awarded​Outstanding​Number 0 0 8,000 25,418    
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      
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 163,404 1,435,319 0      
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod 575,789 789,446 316,520