Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Taxes [Line Items]
Effective tax rate	28.70%	11.20%	7.90%	12.30%
Provision for income taxes	$ 2,800,000	$ 537,000	$ 1,331,000	$ 921,000
Minimum percentage of tax benefit settled for uncertain tax position			50.00%
Unrecognized tax benefits	$ 0	$ 0	$ 0	$ 0
HP
Income Taxes [Line Items]
Effective tax rate	3.60%		3.60%
HII
Income Taxes [Line Items]
Effective tax rate	26.20%		7.50%

[Line Items] for Income Taxes [Table]

No definition available.

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- Definition

The minimum percentage that is likely to be realized of the largest amount of tax benefit to be measured upon settlement of an uncertain tax position.

+ References

No definition available.

+ Details

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Paragraph 12
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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- Definition

Amount of unrecognized tax benefits.

+ References

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-SubTopic 10
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