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Defined Pension Plans (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Pension period     30 years  
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension costs $ 977,000 $ 410,000 $ 1,968,000 $ 820,000
Unfunded Supplemental Executive Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension costs $ 286,000 $ 236,000 $ 571,000 $ 472,000