Pension and Other Postretirement Plans (Plan Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 investments	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Pension Plans [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 19,646,000	$ 18,908,000	$ 16,813,000
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	100.00%	100.00%	100.00%
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Planned assets	0	0
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage pension assets not invested in cash or U.S. Government agencies	96.00%
Number of different investments	225
Acceptable range for each asset class	2.10%
Defined Benefit Pension Plans [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	13,342,000
Defined Benefit Pension Plans [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	6,304,000
Defined Benefit Pension Plans [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	678,000
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	4.00%	1.00%	5.00%
Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	678,000
Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	64.00%	70.00%	60.00%
Defined Benefit Pension Plans [Member] | Equity - Domestic [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	12,390,000
Defined Benefit Pension Plans [Member] | Equity - Domestic [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	12,390,000
Defined Benefit Pension Plans [Member] | Equity - Domestic [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Equity - Domestic [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Equity - International [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	274,000
Defined Benefit Pension Plans [Member] | Equity - International [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	274,000
Defined Benefit Pension Plans [Member] | Equity - International [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Equity - International [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | U.S. government agencies [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | U.S. government agencies [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | U.S. government agencies [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | U.S. government agencies [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Corporate bonds [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	6,304,000
Defined Benefit Pension Plans [Member] | Corporate bonds [Member] | Level 1 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Corporate bonds [Member] | Level 2 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	6,304,000
Defined Benefit Pension Plans [Member] | Corporate bonds [Member] | Level 3 [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0
Defined Benefit Pension Plans [Member] | Debt securities [Member]
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	32.00%	29.00%	35.00%
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0	0
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Planned assets	$ 0	$ 0
Minimum [Member] | Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	0.00%
Minimum [Member] | Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	55.00%
Minimum [Member] | Defined Benefit Pension Plans [Member] | Debt securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	30.00%
Maximum [Member] | Defined Benefit Pension Plans [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	15.00%
Maximum [Member] | Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	70.00%
Maximum [Member] | Defined Benefit Pension Plans [Member] | Debt securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Acceptable range for each asset class	40.00%