Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurements [Abstract]

Assets and liabilities measured at fair value on a recurring basis, by input level

	Level 1		Level 2		Level 3		Total
Municipal Bonds	$	22,072	$	—	$	—	$	22,072
Certificates of Deposit		3,926		—		—		3,926
Total assets at fair value	$	25,998	$	—	$	—	$	25,998

	Level 1		Level 2		Level 3		Total
Municipal Bonds	$	23,697	$	—	$	—	$	23,697
Certificates of Deposit		4,907		—		—		4,907
Total assets at fair value	$	28,604	$	—	$	—	$	28,604