Pension Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plan	2
Minimum age of employee to enroll in defined benefit pension plan	21 years
Minimum service period required for employees to enroll in pension plan	1 year
Minimum age of postretirement medical benefit plan enrollment	55 years
Minimum service period of postretirement medical benefit plan enrollment	10 years
Target allocations maximum	10.00%
Expected contributions	$ 200,000
Participant's contribution percentage	100.00%
Employer matching contribution percentage	100.00%
Company contributions	400,000	400,000
Deferred compensation liability balance	300,000	300,000
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations minimum	50.00%
Target allocations maximum	60.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations minimum	40.00%
Target allocations maximum	50.00%
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations minimum	0.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of return assumption	7.00%	8.00%
Projected benefit obligation	21,200,000	18,500,000
Fair value of plan assets	13,200,000	13,100,000
Unfunded projected benefit obligation	8,100,000	5,400,000
Increase in pension liability	2,700,000
(Decrease) in accumulated other comprehensive income	2,500,000
Company contributions	219,000	520,000
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of return assumption	1.50%	8.00%
Projected benefit obligation	2,900,000	2,800,000
Fair value of plan assets	2,100,000
Unfunded projected benefit obligation	800,000
Increase in pension liability	100,000
(Decrease) in accumulated other comprehensive income	(100,000)
Assumed health care cost trend rate	7.50%	8.50%
Grading down rate	5.00%
Percentage of health care cost trend rate grade down each year	0.50%
Effect of 1.0% increase on accumulated postretirement benefit obligation	300,000
Effect of 1.0% decrease on accumulated postretirement benefit obligation	(200,000)
Company contributions	$ 85,000	$ 134,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contributions matched by employer	4.50%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contributions matched by employer	4.00%