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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