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Investments - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Other investments, at cost	$ 46,867	$ 26,654
Debt Securities, Available-for-sale, Restricted	$ 416,000	$ 433,700
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%	10.00%
Mortgage-backed securities, weighted average life	4 years

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- Definition

Maximum percentage of shareholders' equity security holdings held of one issuer.

+ References

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- Definition

Mortgage-backed securities, weighted average life

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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- Definition

Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(1))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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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.

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