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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal statutory tax rate (percent) | 35.00% | 35.00% |
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 8,352 | $ 8,260 | $ 7,300
Unrecognized tax benefits, income tax penalties and interest accrued | 1,200 |  | $ 900
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 41,200 |  |
State Tax [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 32,300 |  |
State Tax [Member] | Tax Year 2025 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 1,100 |  |
State Tax [Member] | Latest Tax Year [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 7,700 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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