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
Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	$ 57,181	$ 66,392	$ 76,406	$ 84,783
Available-for-sale securities including cash and cash equivalents, Amortized Cost Total	124,051	226,943
Less amounts classified as cash equivalents, Amortized Cost	(57,181)	(66,392)	$ (76,406)	$ (84,783)
Available-for-sale Debt Securities, Amortized Cost Basis, Total	66,870	160,551
Available-for-sale securities, Gross Unrealized Gains	9	17
Available-for-sale securities, Gross Unrealized Losses	(518)	(625)
Available-for-sale Securities, Debt Securities, Current	66,361	159,943
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	57,181	66,392
Cash and cash equivalents and available for sale securities, Fair Value Disclosure	123,542	226,335
Less amounts classified as cash equivalents, Estimated Fair Value	(57,181)	(66,392)
Available-for-sale Securities, Debt Securities, Current	$ 66,361	159,943
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	$ 14,513	21,070
Available-for-sale securities, Gross Unrealized Gains		1
Available-for-sale securities, Gross Unrealized Losses	(172)	(139)
Available-for-sale Securities, Debt Securities, Current	14,341	20,932
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale Securities, Debt Securities, Current	14,341	20,932
Corporate Debt Securities [Member]
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale Debt Securities, Amortized Cost Basis, Total	52,357	139,481
Available-for-sale securities, Gross Unrealized Gains	9	16
Available-for-sale securities, Gross Unrealized Losses	(346)	(486)
Available-for-sale Securities, Debt Securities, Current	52,020	139,011
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale Securities, Debt Securities, Current	52,020	139,011
Cash and money market funds
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	57,181	66,392
Less amounts classified as cash equivalents, Amortized Cost	(57,181)	(66,392)
Available-for-sale securities, Gross Unrealized Losses		0
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	57,181	66,392
Less amounts classified as cash equivalents, Estimated Fair Value	$ (57,181)	$ (66,392)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

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

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No definition available.

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