Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax Credit Carryforward [Line Items]
Effective income tax rate	31.00%	34.00%	36.00%
Federal statutory income tax rate	35.00%
Valuation allowances against deferred tax assets	$ 1,532,000	$ 2,292,000
Net deferred tax asset	22,047,000	22,664,000
State net operating loss carryforwards	3,200,000
Research and development tax credit carryforwards	61,000
Total uncertain tax liability including interest and penalties	2,500,000	2,500,000
Uncertain tax liability recorded as reduction to deferred tax assets		103,000
Uncertain tax liability recorded to non-current liability		2,400,000
Texas Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Other tax credit	$ 163,000