Restricted Stock (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Restricted Stock [Abstract]
Shares of class B restricted stock issued (in shares)	20,119	19,558
Value per share of class B restricted stock issued (in dollars per share)	$ 21.87	$ 22.50
Total value of shares issued	$ 440	$ 440