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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]
Cost, Cash balances	$ 79,749,000	$ 49,060,000	$ 187,026,000
Cost, Debt securities	424,830,000	309,938,000
Cost, Cash balances and Debt securities	504,579,000	358,998,000
Unrealized Gain, Debt securities	11,000	1,000
Unrealized Gain, Cash balances and Debt securities	11,000	1,000
Unrealized Loss, Debt securities	(438,000)	(437,000)
Unrealized Loss, Cash balances and Debt securities	(438,000)	(437,000)
Fair Value, Cash balances	79,749,000	49,060,000
Fair Value, Debt Securities	424,403,000	309,502,000
Fair Value, Cash balances and Debt securities	504,152,000	358,562,000
Debt securities, realized gain (loss)	0	0
Fair value of available-for-sale debt securities in unrealized loss positions	403,100,000	295,100,000
Corporate debt securities, current portion
Debt Securities, Available-for-sale [Line Items]
Cost, Debt securities	240,969,000	199,314,000
Unrealized Gain, Debt securities	7,000	1,000
Unrealized Loss, Debt securities	(250,000)	(303,000)
Fair Value, Debt Securities	240,726,000	199,012,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost, Debt securities	115,245,000	79,878,000
Unrealized Gain, Debt securities	0	0
Unrealized Loss, Debt securities	(104,000)	(75,000)
Fair Value, Debt Securities	115,141,000	79,803,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cost, Debt securities	68,215,000	30,346,000
Unrealized Gain, Debt securities	4,000	0
Unrealized Loss, Debt securities	(84,000)	(59,000)
Fair Value, Debt Securities	68,135,000	30,287,000
Money market
Debt Securities, Available-for-sale [Line Items]
Cost, Debt securities	350,000	350,000
Unrealized Gain, Debt securities	0	0
Unrealized Loss, Debt securities	0	0
Fair Value, Debt Securities	350,000	350,000
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Cost, Debt securities	51,000	50,000
Unrealized Gain, Debt securities	0	0
Unrealized Loss, Debt securities	0	0
Fair Value, Debt Securities	$ 51,000	$ 50,000

X

- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Also includes amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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Cash, Cash Equivalents And Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, Before Tax

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Cash, Cash Equivalents And Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax

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Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents cash and cash equivalents and marketable securities.

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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