Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,911	$ 2,053	$ 4,826	$ 6,684
Net Income Allocated to Class A Common Stock	2,881	2,032	4,777	6,616
Net Income Allocated to Class B Common Stock	$ 30	$ 21	$ 49	$ 68
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Shares Outstanding, Basic	49,019	48,912	48,962	48,762
Weighted Average Shares Outstanding, Diluted	49,030	48,912	48,972	48,764
Basic earnings per share	$ 0.06	$ 0.04	$ 0.10	$ 0.13
Diluted earnings per share	$ 0.06	$ 0.04	$ 0.10	$ 0.13
Common Stock Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Shares Outstanding, Basic and Diluted	1,002	1,002	1,002	1,002
Basic earnings per share	$ 0.03	$ 0.02	$ 0.05	$ 0.07
Diluted earnings per share	$ 0.03	$ 0.02	$ 0.05	$ 0.07