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Revenue Recognition - Impacts of adoption in the current period - SOCF (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,485 | $ 20,910 | $ 10,780 | $ (2,303) | $ 47,377 | $ (20,976) | $ 10,909 | $ 11,584 | $ 34,872 | $ 48,894 | $ 24,214
Materials and supplies, prepayments, and other current assets |  |  |  |  |  |  |  |  | 5,924 | 1,002 | (8,410)
Accrued taxes |  |  |  |  |  |  |  |  | 29,089 | (1,385) | 21,547
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities |  |  |  |  |  |  |  |  | (7,044) | 4,649 | 6,522
Other assets |  |  |  |  |  |  |  |  | (238) | 4,102 | (12,122)
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  | 115,865 | 145,725 | 111,656
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (87,319) | (172,318) | (296,580)
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | (55,230) | (42,101) | 75,334
Net change in cash, cash equivalents, and restricted cash |  |  |  |  |  |  |  |  | (26,983) | $ (68,468) | $ (110,216)
ASU 2014-09 | Change |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 1,699 |  |
Materials and supplies, prepayments, and other current assets |  |  |  |  |  |  |  |  | (1,243) |  |
Accrued taxes |  |  |  |  |  |  |  |  | 131 |  |
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities |  |  |  |  |  |  |  |  | 107 |  |
Other assets |  |  |  |  |  |  |  |  | (694) |  |
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 |  |  |  |  |  |  |  |  | 33,173 |  |
Materials and supplies, prepayments, and other current assets |  |  |  |  |  |  |  |  | 7,167 |  |
Accrued taxes |  |  |  |  |  |  |  |  | 28,958 |  |
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities |  |  |  |  |  |  |  |  | (7,151) |  |
Other assets |  |  |  |  |  |  |  |  | $ 456 |  |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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