Cash, Cash Equivalents, And Available-For-Sale Securities (Fair Value of Cash, Cash Equivalents, and Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	$ 23,021	$ 30,411	$ 76,805	$ 66,392
Available-for-sale securities including cash and cash equivalents, Amortized Cost Total	104,674	111,520
Less amounts classified as cash equivalents, Amortized Cost	(23,021)	(30,411)	$ (76,805)	$ (66,392)
Available-for-sale Debt Securities, Amortized Cost Basis, Total	81,653	81,109
Available-for-sale securities, Gross Unrealized Gains	128	43
Available-for-sale securities, Gross Unrealized Losses	(149)	(314)
Debt Securities, Available-for-sale, Current	81,632	80,838
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	23,021	30,411
Cash and cash equivalents and available for sale securities, Fair Value Disclosure	104,653	111,249
Less amounts classified as cash equivalents, Estimated Fair Value	(23,021)	(30,411)
Debt Securities, Available-for-sale, Current	$ 81,632	80,838
Maximum original contractual maturities of available for sale securities	57 months
U.S. Treasury securities
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale Debt Securities, Amortized Cost Basis, Total	$ 39,004	42,261
Available-for-sale securities, Gross Unrealized Gains	51	34
Available-for-sale securities, Gross Unrealized Losses	(59)	(111)
Debt Securities, Available-for-sale, Current	38,996	42,184
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Debt Securities, Available-for-sale, Current	38,996	42,184
Corporate Debt Securities
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale Debt Securities, Amortized Cost Basis, Total	42,649	38,848
Available-for-sale securities, Gross Unrealized Gains	77	9
Available-for-sale securities, Gross Unrealized Losses	(90)	(203)
Debt Securities, Available-for-sale, Current	42,636	38,654
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Debt Securities, Available-for-sale, Current	42,636	38,654
Cash and money market funds
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	23,021	30,411
Less amounts classified as cash equivalents, Amortized Cost	(23,021)	(30,411)
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	23,021	30,411
Less amounts classified as cash equivalents, Estimated Fair Value	$ (23,021)	$ (30,411)

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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), classified as current.

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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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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. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Represents the maturity period of available-for-sale securities.

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