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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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		$ 0			$ 0
Net unrealized gain on equity investments	2,920	$ 0	2,626	$ 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	$ 0		$ 0			$ 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

X

- 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

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-Publisher FASB
-Name Accounting Standards Codification
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