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Revenue Recognition - Impacts of adoption in the current period - SOCF (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Net income (loss) | $ (2,303) | $ 11,584
Materials and supplies, prepayments, and other current assets | 3,991 | (1,789)
Accrued taxes | 3,292 | 4,341
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities | (2,306) | (14,465)
Other assets | (581) | 2,033
Net Cash Provided by (Used in) Operating Activities | 22,544 | 32,089
Net Cash Provided by (Used in) Investing Activities | (7,077) | (22,622)
Net Cash Provided by (Used in) Financing Activities | (18,130) | (15,628)
Net change in cash, cash equivalents, and restricted cash | (2,694) | $ (5,954)
ASU 2014-09 | Change |  |
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Net income (loss) | 418 |
Materials and supplies, prepayments, and other current assets | (350) |
Accrued taxes | 93 |
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities | 46 |
Other assets | (207) |
Net Cash Provided by (Used in) Operating Activities | 0 |
Net Cash Provided by (Used in) Investing Activities | 0 |
Net Cash Provided by (Used in) Financing Activities | 0 |
Net change in cash, cash equivalents, and restricted cash | 0 |
ASU 2014-09 | Under previous guidance |  |
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Net income (loss) | (2,721) |
Materials and supplies, prepayments, and other current assets | 4,341 |
Accrued taxes | 3,199 |
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities | (2,352) |
Other assets | $ (374) |

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- Definition This element represents the net change during the reporting period in the aggregate amount of obligations and expenses incurred but not paid, which also includes the amount of prepayment by customers for goods or services to be provided and the amount of customer money held in customer accounts, which may also include other current liabilities. + References No definition available. + Details
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- Definition The net change during the reporting period in the value of materials and supplies held in inventory, prepayments, and other current assets. + References No definition available. + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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