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Incentive Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options exercised   0 0
Related income tax benefit recognized in income   $ 8,695 $ 11,796
2012 Long-Term Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Long term plan expiration year   2022  
Maximum number of shares available for issuance   8,700,000  
Maximum number of shares available for issuance, annual rate   1.00%  
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted 599,000    
Exercise price of options granted $ 28.505    
Granted stock options, valuation per option $ 7.96    
Stock-based compensation, fair value assumption model   Black-Scholes valuation model  
Performance Based Restricted Share Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted 556,000    
Stock-based compensation, fair value assumption model   Monte Carlo valuation model  
Performance Based Restricted Share Awards [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 24.10    
Performance Based Restricted Share Awards [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 28.28    
Time Based Restricted Stock Units [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted 282,000    
Fair value per share at grant date $ 28.505    
Time Based Restricted Stock Units [Member] | Non-Employee Director Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted 83,220    
Vesting scheme   These shares vest on the third anniversary of the date of grant.  
Time Based Restricted Stock Units [Member] | Non-Employee Director Plan [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 28.84    
SAR [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted 329,400    
Cash-Settled RSU (RSU-C) [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted 154,150