Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 856	$ 1,512
Net Income Allocated to Class A Common Stock	848	1,497
Net Income Allocated to Class B Common Stock	$ 8	$ 15
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Shares Outstanding, Basic	49,080	48,959
Weighted Average Shares Outstanding, Diluted	49,080	49,004
Basic earnings per share	$ 0.02	$ 0.03
Diluted earnings per share	$ 0.02	$ 0.03
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
Basic earnings per share	$ 0.01	$ 0.02
Diluted earnings per share	$ 0.01	$ 0.02