Percentage of common stock of the reporting entity owned by a third party.

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- Definition

Investments, Target Portfolio Allocations

+ References

No definition available.

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- Definition

Investments, Target Portfolio Allocations, Amount

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- Definition

Number of Investment Committee Members Required to Authorize Investment

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No definition available.

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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=82897076&loc=d3e27161-111563

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- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Subparagraph (a),(b)
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-SubTopic 10
-Section 45
-Paragraph 11
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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Paragraph 11
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-SubTopic 10
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- Definition

Line items represent financial 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

No definition available.

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Investments - Narrative (Details)	12 Months Ended
Investments - Narrative (Details)	Dec. 31, 2017 USD ($) member	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of Investment Committee members required to authorize investment \| member	2
Net realized gains (losses) on sale of securities	$ 10,750,000	$ 795,000	$ 5,311,000
Proceeds from sales of securities	174,507,000	197,548,000	385,695,000
Maturities of securities	14,000,000	185,000,000
Gross Unrealized Losses	3,207,000	1,886,000
Other-than-temporary impairment losses	$ 2,288,000	$ 0	$ 0
Corporate debt securities \| Maximum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	15.00%
Cash, investment grade cash equivalents or U.S. treasury securities \| Minimum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	25.00%
Other aggregated investments \| Minimum \| Securities of any one issuer (excluding the U.S. Government)
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	10.00%
Other aggregated investments \| Maximum \| Securities of any one issuer (excluding the U.S. Government)
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	15.00%
Other aggregated investments \| Maximum \| Single Issuer, Exchange-Traded Common Equities
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	5.00%
Common stock investments \| Maximum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations, amount	$ 100,000,000.0
Common, preferred or other equity investments \| Maximum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations percent	25.00%
Investor \| FCM and FTC
Schedule of Available-for-sale Securities [Line Items]
Common stock ownership percentage	42.33%
Investor \| FCM, FTC and Mr Berkowitz
Schedule of Available-for-sale Securities [Line Items]
Common stock ownership percentage	43.95%