Represents the average remaining maturities for long-term available for sale investments, in years.

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- Definition

Average Remaining Maturities for Short-term Available-for-sale Investments

+ References

No definition available.

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- Definition

Cost Method Investments, Fair Value Disclosure after Impairment

+ References

No definition available.

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- Definition

Cost-method Investments, Aggregate Carrying Amount, Evaluated for Impairment During the Period

+ References

No definition available.

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- Definition

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- Definition

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

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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- Definition

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.

+ 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 210.5-02.12)
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-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
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- Definition

This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting and any losses recognized thereon for impairments of other than a temporary nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
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-Paragraph 1
-Subparagraph (SX 210.7-04(3))
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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Investments (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Investment [Line Items]
Average remaining maturities for short-term available for sale investments	6 months
Average remaining maturities for long-term available for sale investments	2 years
Proceeds from available-for-sale of investments	$ 458,000	$ 234,200
Gross unrealized losses on available-for-sale investments	3,289		$ 3,887
Gain on cost-method investments acquired by third parties	1,100
Other Assets [Member]
Investment [Line Items]
Cost method investments	18,000		$ 19,200
Other Income (Expense) [Member]
Investment [Line Items]
Realized gains on the sales of available-for-sale investments	500	200
Realized losses on the sales of available-for-sale investments	100	200
Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Investment [Line Items]
Cost-method investments, aggregate carrying amount, evaluated for impairment during the period	2,600
Cost method investments, fair value after impairment	1,200
Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Income (Expense) [Member]
Investment [Line Items]
Cost-method Investments, Other than Temporary Impairment	$ 1,400	$ 300