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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment for adoption of new accounting standards						$ 0
Net unrealized loss on equity investments	$ (348)	$ 0	$ 294	$ 0
Future minimum lease payments						3,600
Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment for adoption of new accounting standards						$ 13,627
Retained Earnings | Accounting Standards Update 2018-02
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment for adoption of new accounting standards					$ 3,100
Retained Earnings | Accounting Standards Update 2016-01
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment for adoption of new accounting standards					$ 16,800

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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