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Retirement Plans (Schedule of Costs of Retirement Plans) (Details) - Salaried Benefit Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Contribution Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost Recognized $ 625 $ 799
UNITED STATES    
Defined Contribution Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost Recognized 451 691
CANADA    
Defined Contribution Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost Recognized 59 50
UNITED KINGDOM    
Defined Contribution Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost Recognized $ 115 $ 58