Benefit Plans (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Term of service completed before eligible for coverage		1 year 1000 hours
Employer Matching Contribution, Percent of Match		100.00%
Maximum Annual Contributions Per Employee, Percent		4.00%
Additional Employer Matching Contribution Percent Of Deferral Match From Eligible Compensation		50.00%
Maximum Additional Annual Contributions Per Employee Deferral Percent		2.00%
Employer Discretionary Contribution Percent		100.00%
Maximum Discretionary Profit Sharing Percent Of Eligible Compensation		2.00%
Related plan expense		$ 556,000	$ 442,000	$ 425,000
Additional contribution to plan	6,000,000
Decrease In Funded Status As Result Of Change In Mortality Age		1,600,000
Expected Increase In Pension Expense		$ 272,000
Defined Benefit Plan General Guidelines Plan Asset Allocations		5.00%
Change In Expected Long Term Rate Of Return		6.50%
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		60.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		90.00%
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		10.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		30.00%
Defined Benefit Plan General Guidelines Plan Asset Allocations		25.00%