Common Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common Stock Disclosure [Line Items]
Options exercised	95,000
Realized value, options exercised	$ 136,000
Cash received for options exercised	308,000		248,000
Deemed distribution			877,000
Incremental Shares Issued [Member]
Common Stock Disclosure [Line Items]
Options exercised	41,000
Realized value, options exercised	103,000
In the money shares exercise of options, net	15,822
Exercise price per share	$ 4.01
Market price per share	$ 6.53
Class A [Member]
Common Stock Disclosure [Line Items]
Common stock, shares issued	31,951,945	31,675,518
Common stock, value	223,000	220,000
Options exercised	136,000		90,000
Exercise price per share			$ 2.76
Shares repurchased		172,300	62,375
Value of shares repurchased		747,000	251,000
Common stock, shares canceled			4,348,780
Class A [Member] | Executive Officer [Member]
Common Stock Disclosure [Line Items]
Common stock, shares issued	155,925	174,825	148,616
Class A [Member] | Employee Stock [Member]
Common Stock Disclosure [Line Items]
Common stock, shares issued	9,680
Common stock, value	$ 44,000