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Fair Value of Financial Instruments Level 3 (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at the beginning of the period |  | $ 10,927 | $ 16,435 | $ 43,957
Unrealized (loss) gain included in OCI | [1] | (1,733) | (1,057) | (2,608)
Principal payments |  | (4,351) | (6,019) | (30,602)
Accretion |  | 2,400 | 1,568 | 472
Balance at the end of the period |  | $ 7,243 | $ 10,927 | $ 16,435
[1] | Amount included in “unrealized gain (loss) on available-for-sale investments, net” on consolidated statements of comprehensive income (loss).

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Payments. + References No definition available. + Details
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- Definition Amount of discount accreted during the period for financial instrument classified as an asset whose fair value is measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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