Annual report pursuant to Section 13 and 15(d)

SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - PARENT COMPANY STATEMENTS OF CASH FLOWS (Details)

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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - PARENT COMPANY STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Apr. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]            
Net cash used in operating activities       $ (103,752) $ (109,229) $ (50,430)
Cash flows from investing activities:            
Cash received in acquisition       0 56 210
Net cash used in investing activities       (21,687) (95,565) (10,506)
Cash flows from financing activities:            
Proceeds from the issuance of common stock       133,800 318,204 59,015
Tax payments for net share settlement of equity awards       (5,734) (828) 0
Proceeds from the issuance of preferred stock       0 0 25,000
Equity offering costs $ (3,600) $ (5,200)   (4,090) (5,707) (1,681)
Net cash provided by financing activities       180,755 311,669 82,334
Cash and cash equivalents, beginning of period       128,273 21,398  
Cash and cash equivalents, end of period   128,273 $ 210 133,714 128,273 21,398
Parent [Member]            
Condensed Cash Flow Statements, Captions [Line Items]            
Net cash used in operating activities       (123,976) (312,553)  
Cash flows from investing activities:            
Cash received in acquisition       0 56  
Acquisition and development of natural gas properties       0 0  
Net cash used in investing activities       0 56  
Cash flows from financing activities:            
Proceeds from the issuance of common stock       133,800 318,204  
Tax payments for net share settlement of equity awards       (5,734) 0  
Proceeds from the issuance of preferred stock       0 0  
Equity offering costs       (4,090) (5,707)  
Net cash provided by financing activities       123,976 312,497  
Net increase (decrease) in cash and cash equivalents       0 0  
Cash and cash equivalents, beginning of period       0 0  
Cash and cash equivalents, end of period   $ 0   $ 0 0 0
Tellurian Investments, Inc. [Member] | Parent [Member]            
Condensed Cash Flow Statements, Captions [Line Items]            
Net cash used in operating activities           (60,532)
Cash flows from investing activities:            
Cash received in acquisition           210
Acquisition and development of natural gas properties           (1,190)
Net cash used in investing activities           (980)
Cash flows from financing activities:            
Proceeds from the issuance of common stock           59,015
Tax payments for net share settlement of equity awards           0
Proceeds from the issuance of preferred stock           25,000
Equity offering costs           (1,681)
Net cash provided by financing activities           82,334
Net increase (decrease) in cash and cash equivalents           20,822
Cash and cash equivalents, beginning of period     $ 0   $ 20,822 0
Cash and cash equivalents, end of period           $ 20,822