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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Cash Flow from Operating Activities (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Consolidated Statement of Cash Flow from Operating Activities [Abstract]                      
Net income $ (2,765,000) $ (3,102,000) $ 3,513,000 $ (5,495,000) $ 8,376,000 $ (2,527,000) $ 5,595,000 $ 7,820,000 $ (7,849,000) $ 19,264,000 $ 38,735,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]                      
Deferred income taxes                 (3,063,000) 1,548,000 6,840,000
Income tax receivable                 (2,039,000) (6,312,000) (1,631,000)
Prepaid expenses and other current assets                 234,000 (965,000) (1,307,000)
Other assets                 (299,000) (120,000) (304,000)
Accounts payable and accrued liabilities                 16,572,000 (11,671,000) 12,447,000
Long-term core inventory                   0 0
Other liabilities                 1,214,000 1,261,000 (1,048,000)
Net cash used in operating activities                 $ (40,328,000) (13,944,000) (5,269,000)
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]                      
Consolidated Statement of Cash Flow from Operating Activities [Abstract]                      
Net income                   18,826,000 38,776,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]                      
Deferred income taxes                   1,495,000 6,865,000
Income tax receivable                   (6,312,000)  
Prepaid expenses and other current assets                   (2,825,000) (4,882,000)
Other assets                   404,000 (4,364,000)
Accounts payable and accrued liabilities                   (11,671,000) 12,447,000
Long-term core inventory                   (46,978,000) (25,245,000)
Other liabilities                     (1,048,000)
Net cash used in operating activities                   (13,944,000) (5,269,000)
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member]                      
Consolidated Statement of Cash Flow from Operating Activities [Abstract]                      
Net income                   16,316,000 37,573,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]                      
Deferred income taxes                   3,055,000 6,510,000
Income tax receivable                   (6,081,000)  
Prepaid expenses and other current assets                   (2,507,000) (4,333,000)
Other assets                   (384,000) (3,339,000)
Accounts payable and accrued liabilities                   (11,621,000) 12,446,000
Long-term core inventory                   (45,839,000) (24,964,000)
Other liabilities                     (1,344,000)
Net cash used in operating activities                   (13,944,000) (5,269,000)
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]                      
Consolidated Statement of Cash Flow from Operating Activities [Abstract]                      
Net income                   2,510,000 1,203,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]                      
Deferred income taxes                   (1,560,000) 355,000
Income tax receivable                   (231,000)  
Prepaid expenses and other current assets                   (318,000) (549,000)
Other assets                   788,000 (1,025,000)
Accounts payable and accrued liabilities                   (50,000) 1,000
Long-term core inventory                   (1,139,000) (281,000)
Other liabilities                     296,000
Net cash used in operating activities                   $ 0 $ 0