Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of beginning of year	$ 235,000	$ 301,000
Additions for tax positions related to the current year	62,000	51,000
Additions for tax positions related to prior years	0	0
Reduction due to lapse of statute of limitations	(63,000)	(117,000)
Balance as of end of year	$ 234,000	$ 235,000