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Revenue from Contracts with Customers (Narrative) (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) contract item segment agreement | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Number of geographic segments | segment | 3 |  |
Number of revenue streams | item | 3 |  |
Receivables from contracts with customers | $ 190,700,000 |  | $ 203,400,000
Impairment losses on receivables or contract assets | 0 | $ 0 |
Revenue, remaining performance obligation | $ 0 |  |
Malaysia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Number of production sharing contracts | contract | 9 |  |
Number of gas sale agreements | agreement | 3 |  |

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- Definition Amount of credit loss recognized for write-down of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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