Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value

The following table presents the Company’s financial assets and liabilities which are measured at fair values on a recurring basis and that are subject to the disclosure requirements as of March 31, 2013 and December 31, 2012 (in thousands).

	Fair Value		Level 1		Level 2		Level 3
March 31, 2013
Assets:
Overnight repurchase agreements	$	129,784	$	—	$	129,784	$	—
Total	$	129,784	$	—	$	129,784	$	—
December 31, 2012
Assets:
Overnight repurchase agreements	$	128,629	$	—	$	128,629	$	—
Certificates of deposit		11,849		—		11,849		—
Total	$	140,118	$	—	$	140,118	$	—