Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592

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Long-Term Investments (Cost-Method Investments) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($) investment	Dec. 31, 2017 USD ($)
Schedule of Cost-method Investments [Line Items]
Cost-method investments, carrying value	$ 0		$ 65,450
Cost-method investments, fair value			74,111
Purchase of long-term investments	$ 0	$ 22,400
Cash distributions from cost method investments		(466)
Investment partnerships
Schedule of Cost-method Investments [Line Items]
Cost-method investments, carrying value			65,450
Cost-method investments, fair value			$ 74,111
Investment partnerships \| Five New Investment Funds
Schedule of Cost-method Investments [Line Items]
Purchase of long-term investments		$ 21,400
Number of investments in funds \| investment		5
Investment partnerships \| One Existing Investment
Schedule of Cost-method Investments [Line Items]
Purchase of long-term investments		$ 1,000
Number of investments in funds \| investment		1