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Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits before impact of deductions for state taxes, excluding interest and penalties	$ 1,184	$ 795
Unrecognized tax benefits that would impact effective tax rate	33	$ 17
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at December 31, 2015	755
Increase related to tax positions taken during a prior year, including interest	397
Reductions related to tax positions taken in a prior year, including interest	(20)
Balance at December 31, 2016	1,132
Accrued interest expense net of the benefit of tax deductions	33
Cumulative reduction in unrecognized tax benefits, due to lapsing of statutes of limitations	$ 16

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Unrecognized Tax Benefits, Gross

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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