Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension plan, overfunded amount	$ 1,500,000
Discount rate	3.75%
Rate of compensation increase	4.75%
Maximum percentage of equity securities in any single industry (in hundredths)	25.00%
Maximum percentage of fixed income securities by any issuer	10.00%
Maximum percentage of equity securities in any single corporation	10.00%
Health care cost trend rate assumed in 2014-2080	9.90%
Dental care cost trend rate assumed in 2014-2080	5.00%
Decrease health care cost trend rate in 2014	3.10%
Decrease health care cost trend rate in 2015	0.70%
Increase health care cost trend rate in 2016	0.20%
Defined Benefit Plan Assumed Health Care Cost Trend Rate Decrease In Year 2017-2023	0.20%
Accumulated benefit obligations for pension plan	30,100,000	33,100,000
Multiemployer contribution	3,011,000	3,195,000	3,548,000
Stock Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares authorized under the plan	400,000
Shares available to be issued under plan	118,705
Chairman One [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability for future policy benefits of former chairman	822,000
Future policy benefits reserve	822,000	822,000
Chairman Two [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability for future policy benefits of former chairman	627,000
Future policy benefits reserve	480,000	457,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	34,414,000	28,913,000	25,645,000
Projected pension obligation	32,897,000	36,617,000	32,496,000
Discount rate	4.75%	3.75%
Rate of compensation increase	4.50%	4.50%
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected pension obligation	12,530,000	13,084,000	11,898,000
Discount rate	4.75%	3.75%
401(k) [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution amount	118,000	102,000	102,000
Annual contribution per employee amount	2,000
Annual contribution per employee percentage	50.00%
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation	70.00%
Actual plan asset allocation	71.50%	70.00%
Fair value of assets	24,600,000	20,200,000
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation	30.00%
Actual plan asset allocation	28.50%	30.00%
Fair value of assets	$ 9,800,000	$ 8,700,000