Pension and Other Postretirement Plans (Defined Contribution Pension Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Additional company's matching contribution	1.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	2.00%
Total company contribution, 401(k) plan	$ 323,000
Non-Qualified Contribution Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, non-qualified deferred compensation	66,000	62,000	64,000
401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, 401(k) plan		$ 344,000	$ 429,000
Defined Contribution Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent		1.00%