Pension and Other Postretirement Plans (Defined Contribution Pension Plans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Additional company's matching contribution	4.00%		3.00%
Non-Qualified Contribution Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, non-qualified deferred compensation	$ 103,667	$ 99,000		$ 140,000
401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, 401(k) plan	$ 489,000	$ 491,000	$ 410,000
Company's employee annual contribution percentage for 401K		4.00%