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Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2013

Cash, Cash Equivalents and Marketable Securities [Abstract]

Summary of investments in cash, cash equivalents and marketable securities

The following table summarizes our investments in cash equivalents and marketable securities held by investment managers and overnight investments:

		December 31,
		2013				2012
		(in thousands)
Overnight holdings:
Money market funds (cash equivalents)		$	192,040			$	255,000
Investment holdings:
Money market funds (cash equivalents)		42,913				26,087
Marketable securities		46,340				16,904
		281,293				297,991
Cash held in demand accounts		23,054				21,732
Outstanding checks		(32,252		)		(38,275		)
Total cash, cash equivalents and marketable securities		$	272,095			$	281,448
Cash and cash equivalents		$	225,755			$	264,544
Marketable securities		46,340				16,904
		$	272,095			$	281,448

Summary of fair value measurements of financial assets

The following tables summarize the levels of fair value measurements of our financial assets:

		Fair Value Measurements
						(in thousands)
		December 31, 2013				Level 1				Level 2				Level 3
Money market funds		$	234,953			$	234,953			$	—			$	—
Municipal bonds		46,340				—				46,340				—
Total		$	281,293			$	234,953			$	46,340			$	—

		Fair Value Measurements
						(in thousands)
		December 31, 2012				Level 1				Level 2				Level 3
Money market funds		$	281,087			$	281,087			$	—			$	—
Municipal bonds		16,904				—				16,904				—
Total		$	297,991			$	281,087			$	16,904			$	—

Summary of available-for-sale securities

The following is a summary of our available-for-sale marketable securities:

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
						(in thousands)
December 31, 2013
Municipal bonds		$	46,290			$	51			$	(1	)		$	46,340
December 31, 2012
Municipal bonds		$	16,878			$	29			$	(3	)		$	16,904

Contractual maturities of marketable securities

As of December 31, 2013, the contractual maturities of our marketable securities were as follows:

		Amortized Cost				Estimated Fair Value
		(in thousands)
Less than one year		$	29,077			$	29,098
One to five years		17,213				17,242
Total		$	46,290			$	46,340

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Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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