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Income Taxes - Change in Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Change in unrecognized tax benefits |  |  |
Balance as of January 1 | $ 188,376 | $ 201,338 | $ 47,552
Additions based on tax positions related to the current year |  | 384 | 167,107
Additions for tax positions of prior years | 3,873 |  | 1,744
Reductions for tax positions of prior years | (11,547) | (9,234) | (6,843)
Settlements | (1,447) | (4,112) | (8,222)
Balance as of December 31 | 179,255 | 188,376 | 201,338
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation | 2,100 | 2,000 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 1,100 |
Additions based on tax positions related to the current year due to internal restructuring |  |  | 166,000
Reductions for tax positions for prior years due to expiration of statutes |  | 1,100 |
Interest and penalties on unrecognized tax benefits | 9,200 | 7,400 | 19,200
Liability related to unrecognized tax benefit for accrued interest and penalties | 600 | 1,400 | 6,100
Canada, Trinidad and U.S |  |  |
Change in unrecognized tax benefits |  |  |
Settlements | (6,000) |  |
Colombia, Ecuador, Canada and Montana |  |  |
Change in unrecognized tax benefits |  |  |
Settlements |  | $ (5,000) |
Algeria Canada And Oman Settlements |  |  |
Change in unrecognized tax benefits |  |  |
Settlements |  |  | $ (7,600)
Australia Algeria And Mexico |  |  |
Change in unrecognized tax benefits |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 7,200 |  |
Reductions for tax positions for prior years due to expiration of statutes | 7,200 |  |
Trinidad [Member] |  |  |
Change in unrecognized tax benefits |  |  |
Settlements | $ (2,000) |  |

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- Definition 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 + Details
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