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Investments - Schedule of Other Invested Assets - Common Stock Purchase Warrants and Call Options (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Fair Value	$ 51,519	$ 49,682
Derivative
Investment Holdings [Line Items]
Cost	6,562	8,063
Gains	180	428
Losses	(2,929)	(3,648)
Fair Value	3,813	4,843
Warrant
Investment Holdings [Line Items]
Cost	6,332	6,383
Gains	180	428
Losses	(2,919)	(2,600)
Fair Value	3,593	4,211
Call options
Investment Holdings [Line Items]
Cost	230	1,680
Gains	0	0
Losses	(10)	(1,048)
Fair Value	$ 220	$ 632

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in 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 (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in 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=27724398&loc=d3e27161-111563

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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