Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Refundable income taxes			$ 4,800,000
Federal tax carryforwards	6,459,000	11,774,000	15,100,000
Income taxes paid				5,200,000
Deferred income tax expense (benefit)	(2,998,000)	12,635,000	10,072,000
Operating Loss Carryforwards	52,500,000
Tax Adjustments, Settlements, and Unusual Provisions		(1,300,000)
Investment Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Deferred tax credit recognition period	15 years
Deferred income tax expense (benefit)	(47,000)	(195,000)	(125,000)
Tax Credit Carryforward, Valuation Allowance	1,000,000
Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Refundable income taxes	615,000
Tax Credit Carryforward, Amount	726,000
Deferred income tax expense (benefit)	$ 633,000	$ 550,000
Minimum [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Open Tax Year	2009
Minimum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Open Tax Year	2009
Maximum [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Open Tax Year	2011
Maximum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Open Tax Year	2012