Pension Plans And Other Postretirement Benefits (Schedule of Pension Plan Assets By Asset Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 13,181	$ 13,116	$ 12,443
Pension Benefits [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,394	6,777
Pension Benefits [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,426	5,528
Pension Benefits [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	361	811
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,181	6,777
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,394	1,361
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,426	4,605
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	361	811
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets		6,339
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets		5,416
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets		923
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,093	2,206	2,221
Postretirement Benefits [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,770	1,744
Postretirement Benefits [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	323	462
Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,093	2,206
Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,770	1,744
Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 323	$ 462