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Income Taxes, Tax reform (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
U.S. statutory rate (as a percent)		35.00%
Decrease in net deferred tax assets		$ 2,487
Scenario, Forecast [Member]
U.S. statutory rate (as a percent)	21.00%
Threshold compensation for deductibility	$ 1,000
Number of most highly compensated executive officers for deductibility of compensation | item	3
Bonus depreciation percentage	100.00%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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- Definition

Represents the percentage of bonus depreciation.

+ References

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- Definition

The specified number of the most highly compensated executive officers for any fiscal year relating to deductibility of compensation for the Tax Cuts and Jobs Act.

+ References

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- Definition

Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

+ References

No definition available.

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- Definition

The threshold amount of compensation paid to anyone serving as the Chief Executive Officer or Chief Financial Officer, or who is amount the three most highly compensated executive officers for any fiscal year for the amount to be deductible by the entity.

+ References

No definition available.

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