Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at March 31, 2014 and December 31, 2013 were as follows:

			Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
March 31, 2014
	Available-for-sale securities:
		Corporate bonds and notes	$	19,605	$	149	$	(17	)	$	19,737
		Municipal bonds	6,620		29		(7		)	6,642
	Total available-for-sale securities		$	26,225	$	178	$	(24	)	$	26,379

			Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
December 31, 2013
	Available-for-sale securities:
		Corporate bonds and notes	$	18,832	$	68	$	(43	)	$	18,857
		Municipal bonds	6,658		22		(11		)	6,669
	Total available-for-sale securities		$	25,490	$	90	$	(54	)	$	25,526

Available-for-sale Securities

Maturities of marketable securities classified as available-for-sale securities were as follows at March 31, 2014:

		Amortized cost		Estimated fair value
March 31, 2014
	Due within one year	$	4,724	$	4,734
	Due after one year through five years	19,927		20,036
	Due after five years through ten years	1,574		1,609
	Total available-for-sale securities	$	26,225	$	26,379