Stock Option Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised	186,059	118,823	61,677
Proceeds from stock options exercised	$ 2,000,000	$ 1,300,000	$ 538,000
Options exercised during the period, intrinsic value	$ 2,200,000	$ 1,000,000	$ 377,000
Options granted	0	0	0
Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	352,741
Shares remaining to be granted under plan	58,000
2000 Stock Option Plan [Member].
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	194,662
Options granted	0	0	0