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Shareholders' Equity (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
plan
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares authorized (in shares) | shares 100,000,000 100,000,000    
Authorized preferred stock (in shares) | shares 50,000,000 50,000,000    
Authorization common shares for the issuance under incentive compensation plans (in shares) | shares 2,400,000      
Number of shares available for grant (in shares) | shares 700,000.0      
Dividends declared $ 119,900 $ 220,500 $ 64,800  
Equity attributable to parent 1,958,354 2,157,944 $ 2,394,414 $ 2,270,580
Total authorizations which remain available for use (in shares) 111,700      
Increase in amount authorized to repurchase shares 100,000      
Losses related to unrecognized changes in defined benefit plan liabilities $ (1,000)      
Number of defined benefit plans assumed in acquisition | plan 2      
Impairment losses in accumulated other comprehensive income $ 2,000 $ 500    
AOCI losses unrecognized changes in defined benefit plan liabilities, net $ (1,000)      
Percentage of income before income taxes included in expected income tax expense 35.00% 35.00% 35.00%  
Retained Earnings, Unappropriated [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity attributable to parent $ 592,000