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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2017
Income Tax Uncertainties [Abstract] |
Unrecognized Tax Benefits Related To Uncertain Tax Positions [Table Text Block] | The net interest and penalties expense recognized were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Net interest and penalties expense | $ | 207 |  |  | $ | 233 |  |  | $ | 413 |  |  | $ | 332 |
Accrued interest and penalties recognized were as follows:
| June 30, 2017 |  | December 31, 2016
| (in thousands)
Accrued interest | $ | 3,435 |  |  | $ | 2,473 |
Accrued penalties | 2,509 |  |  | 2,329 |
Unrecognized tax benefits related to uncertain tax positions and the amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate were as follows:
| June 30, 2017 |  | December 31, 2016
| (in thousands)
Unrecognized tax benefits related to uncertain tax positions | $ | 64,396 |  |  | $ | 57,626 |
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | 63,067 |  |  | 56,411 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32840-109319 + Details
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