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Fair Value Measurements Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value [Abstract]

Available-for-sale Securities [Table Text Block]

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, 2016
Municipal bonds		$	1,854			$	—			$	(3	)		$	1,851
December 31, 2015
Municipal bonds		$	9,875			$	3			$	(3	)		$	9,875

Marketable Securities [Table Text Block]

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

		Fair Value Measurements
						(in thousands)
		December 31, 2016				Level 1				Level 2				Level 3
Money market funds		$	283,322			$	283,322			$	—			$	—
Municipal bonds		1,851				—				1,851				—
Total		$	285,173			$	283,322			$	1,851			$	—

		Fair Value Measurements
						(in thousands)
		December 31, 2015				Level 1				Level 2				Level 3
Money market funds		$	273,768			$	273,768			$	—			$	—
Municipal bonds		9,875				—				9,875				—
Total		$	283,643			$	273,768			$	9,875			$	—

Investments Classified by Contractual Maturity Date [Table Text Block]

As of December 31, 2016, the contractual maturities of our marketable securities were as follows:

		Amortized Cost				Estimated Fair Value
		(in thousands)
Less than one year		$	1,299			$	1,299
One to five years		555				552
Total		$	1,854			$	1,851

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Fair Value [Abstract]

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
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Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2.

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Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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