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Pay vs Performance Disclosure
 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Pay vs Performance Disclosure [Table]        
Pay vs Performance [Table Text Block]  
2022 Pay Versus Performance
The following table and supporting narrative contain information regarding compensation paid to our NEOs and the relationship to company performance.
Pay Versus Performance Table
​
Year
(1)
​ ​
Summary
Compensation
Table Total
for
Jensen
(Former PEO)
($)
 ​ ​
Compensation
Actually Paid
to
Jensen
(Former PEO)
($) (2)(3)
 ​ ​
Summary
Compensation
Table Total
for
Heissenbuttel
(Current PEO)
($)
 ​ ​
Compensation
Actually Paid
to
Heissenbuttel
(Current PEO)
($) (2)(3)
 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Value of Initial
Fixed $100
Investment
Based on:
 ​ ​
Net
Income
($)
 ​ ​
Adjusted
Cash
G&A
Expense
($) (5)
 ​
​
Average
Summary
Compensation
Table Total for
Non-PEO
NEOs
($)
 ​ ​
Average
Compensation
Actually
Paid to
Non-
PEO NEOs
($) (2)(3)
 ​ ​
TSR
($)
 ​ ​
Peer
Group
TSR
($) (4)
 ​
​ 2022 ​ ​ ​ $ 0 ​ ​ ​ ​ $ 0 ​ ​ ​ ​ $ 3,060,540 ​ ​ ​ ​ $ 3,540,577 ​ ​ ​ ​ $ 1,340,295 ​ ​ ​ ​ $ 1,519,307 ​ ​ ​ ​ ​ 114.3 ​ ​ ​ ​ ​ 151.2 ​ ​ ​ ​ $ 238,981,683 ​ ​ ​ ​ $ 25,636,590 ​ ​
​
2021 Stub
​ ​ ​ $ 0 ​ ​ ​ ​ $ 0 ​ ​ ​ ​ $ 3,148,212 ​ ​ ​ ​ $ 2,698,385 ​ ​ ​ ​ $ 1,253,741 ​ ​ ​ ​ $ 1,098,874 ​ ​ ​ ​ ​ 105.4 ​ ​ ​ ​ ​ 162.4 ​ ​ ​ ​ $ 138,338,721 ​ ​ ​ ​ $ 11,944,744 ​ ​
​ 2021 ​ ​ ​ $ 0 ​ ​ ​ ​ $ 0 ​ ​ ​ ​ $ 3,042,284 ​ ​ ​ ​ $ 2,498,478 ​ ​ ​ ​ $ 1,403,420 ​ ​ ​ ​ $ 1,160,025 ​ ​ ​ ​ ​ 113.6 ​ ​ ​ ​ ​ 171.4 ​ ​ ​ ​ $ 302,532,476 ​ ​ ​ ​ $ 22,657,145 ​ ​
​ 2020 ​ ​ ​ $ 4,141,033 ​ ​ ​ ​ $ 5,618,723 ​ ​ ​ ​ $ 2,403,556 ​ ​ ​ ​ $ 3,001,054 ​ ​ ​ ​ $ 1,223,674 ​ ​ ​ ​ $ 1,123,128 ​ ​ ​ ​ ​ 122.5 ​ ​ ​ ​ ​ 154.8 ​ ​ ​ ​ $ 199,343,108 ​ ​ ​ ​ $ 21,078,698 ​ ​
​
1.
For each of calendar year 2022, the six-month transition period ended December 31, 2021, and the fiscal year ended June 30, 2021, our principal executive officer (“PEO”) was Mr. Heissenbuttel and our non-PEO NEOs were Messrs. Isto, Breeze, Libner and Shefman. For the fiscal year ended June 30, 2020, our PEO included Mr. Jensen (our former President and CEO) from July 1, 2019, until his retirement on January 2, 2020, and Mr. Heissenbuttel from January 2, 2020, until June 30, 2020. Also, for the fiscal year ended June 30, 2020, our non-PEO NEOs included Mr. Kirchhoff  (our former General Counsel and Corporate Secretary) from July 1, 2019, until his retirement on January 2, 2020, and each of Messrs. Isto, Breeze, Libner and Shefman.
​
2.
The valuation of stock options uses the Black-Scholes-Merton methodology, and the valuation of performance
​
shares uses a Monte Carlo valuation model. See Note 9 — Stock-Based Compensation in Item 8 — Financial Statements and Supplementary Data in the 2022 Form 10-K.
3.
Adjustments to Total Compensation from the Summary Compensation Table to arrive at compensation actually paid pursuant to SEC rules (“SEC CAP”) to Mr. Jensen as PEO, Mr. Heissenbuttel as PEO and to our non-PEO NEOs are as detailed in Annex A to this report.
​
4.
TSR comparison for all periods is to the PHLX Gold and Silver Index.
​
5.
Adjusted Cash G&A Expense, which is a non-GAAP financial measure, is calculated as our G&A Expense less (a) non-cash employee stock compensation expense and (b) litigation expense.
​
​
​ ​ ​ ​
PEO — JENSEN
 ​ ​
PEO — HEISSENBUTTEL
 ​ ​
Non-PEO NEO Average
 ​
​
Adjustments
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​
​
Summary Compensation Table Total
 ​ ​ ​ $ 4,141,033 ​ ​ ​ ​ $ 3,060,540 ​ ​ ​ ​ $ 3,148,212 ​ ​ ​ ​ $ 3,042,284 ​ ​ ​ ​ $ 2,403,556 ​ ​ ​ ​ $ 1,340,295 ​ ​ ​ ​ $ 1,253,741 ​ ​ ​ ​ $ 1,403,420 ​ ​ ​ ​ $ 1,223,674 ​ ​
​
Deduction for amount reported in “Stock
Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ (1,298,851) ​ ​ ​ ​ $ (2,303,817) ​ ​ ​ ​ $ (1,133,532) ​ ​ ​ ​ $ (842,551) ​ ​ ​ ​ $ (461,867) ​ ​ ​ ​ $ (805,984) ​ ​ ​ ​ $ (445,980) ​ ​ ​ ​ $ (385,533) ​ ​
​
Deduction for amounts reported in
“Option Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (635,796) ​ ​ ​ ​ $ (413,142) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (250,379) ​ ​ ​ ​ $ (185,426) ​ ​
​
Addition of fair value at fiscal year (FY)
end, of equity awards granted during the
FY that remained outstanding
​ ​ ​ $ — ​ ​ ​ ​ $ 1,211,452 ​ ​ ​ ​ $ 2,002,130 ​ ​ ​ ​ $ 1,269,313 ​ ​ ​ ​ $ 1,198,724 ​ ​ ​ ​ $ 430,770 ​ ​ ​ ​ $ 700,439 ​ ​ ​ ​ $ 499,547 ​ ​ ​ ​ $ 424,309 ​ ​
​
Addition of fair value at vesting date, of
equity awards granted during the FY that
vested during the FY
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 72,685 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 28,658 ​ ​ ​ ​ $ — ​ ​
​
Addition of change in fair value at FY end
versus prior FY end for awards granted in
prior FY that remained outstanding
​ ​ ​ $ (117,491) ​ ​ ​ ​ $ 450,092 ​ ​ ​ ​ $ (309,326) ​ ​ ​ ​ $ (441,433) ​ ​ ​ ​ $ 324,055 ​ ​ ​ ​ $ 155,472 ​ ​ ​ ​ $ (136,617) ​ ​ ​ ​ $ (201,079) ​ ​ ​ ​ $ 108,236 ​ ​
​
Addition of change in fair value at vesting
date versus prior FY end for awards
granted in prior FY that vested during the
FY
​ ​ ​ $ 1,578,106 ​ ​ ​ ​ $ 88,499 ​ ​ ​ ​ $ 153,336 ​ ​ ​ ​ $ 308,068 ​ ​ ​ ​ $ 315,216 ​ ​ ​ ​ $ 42,553 ​ ​ ​ ​ $ 83,256 ​ ​ ​ ​ $ 118,294 ​ ​ ​ ​ $ 158,272 ​ ​
​
Deduction of the fair value at the prior FY
end for awards granted in prior FY that
failed to meet their vesting conditions
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (227,170) ​ ​
​
Addition in respect of any dividends or
other earnings paid during applicable FY
prior to vesting date of underlying award
​ ​ ​ $ 17,076 ​ ​ ​ ​ $ 28,845 ​ ​ ​ ​ $ 7,850 ​ ​ ​ ​ $ 16,889 ​ ​ ​ ​ $ 15,195 ​ ​ ​ ​ $ 12,084 ​ ​ ​ ​ $ 4,039 ​ ​ ​ ​ $ 7,545 ​ ​ ​ ​ $ 6,765 ​ ​
​
SEC CAP
 ​ ​ ​ $ 5,618,723 ​ ​ ​ ​ $ 3,540,577 ​ ​ ​ ​ $ 2,698,385 ​ ​ ​ ​ $ 2,498,478 ​ ​ ​ ​ $ 3,001,054 ​ ​ ​ ​ $ 1,519,307 ​ ​ ​ ​ $ 1,098,874 ​ ​ ​ ​ $ 1,160,025 ​ ​ ​ ​ $ 1,123,128 ​ ​
   
Company Selected Measure Name   Adjusted Cash G&A Expense    
Named Executive Officers, Footnote [Text Block]  
1.
For each of calendar year 2022, the six-month transition period ended December 31, 2021, and the fiscal year ended June 30, 2021, our principal executive officer (“PEO”) was Mr. Heissenbuttel and our non-PEO NEOs were Messrs. Isto, Breeze, Libner and Shefman. For the fiscal year ended June 30, 2020, our PEO included Mr. Jensen (our former President and CEO) from July 1, 2019, until his retirement on January 2, 2020, and Mr. Heissenbuttel from January 2, 2020, until June 30, 2020. Also, for the fiscal year ended June 30, 2020, our non-PEO NEOs included Mr. Kirchhoff  (our former General Counsel and Corporate Secretary) from July 1, 2019, until his retirement on January 2, 2020, and each of Messrs. Isto, Breeze, Libner and Shefman.
   
Peer Group Issuers, Footnote [Text Block]  
4.
TSR comparison for all periods is to the PHLX Gold and Silver Index.
   
Adjustment To PEO Compensation, Footnote [Text Block]  
3.
Adjustments to Total Compensation from the Summary Compensation Table to arrive at compensation actually paid pursuant to SEC rules (“SEC CAP”) to Mr. Jensen as PEO, Mr. Heissenbuttel as PEO and to our non-PEO NEOs are as detailed in Annex A to this report.
​
​ ​ ​ ​
PEO — JENSEN
 ​ ​
PEO — HEISSENBUTTEL
 ​ ​
Non-PEO NEO Average
 ​
​
Adjustments
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​
​
Summary Compensation Table Total
 ​ ​ ​ $ 4,141,033 ​ ​ ​ ​ $ 3,060,540 ​ ​ ​ ​ $ 3,148,212 ​ ​ ​ ​ $ 3,042,284 ​ ​ ​ ​ $ 2,403,556 ​ ​ ​ ​ $ 1,340,295 ​ ​ ​ ​ $ 1,253,741 ​ ​ ​ ​ $ 1,403,420 ​ ​ ​ ​ $ 1,223,674 ​ ​
​
Deduction for amount reported in “Stock
Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ (1,298,851) ​ ​ ​ ​ $ (2,303,817) ​ ​ ​ ​ $ (1,133,532) ​ ​ ​ ​ $ (842,551) ​ ​ ​ ​ $ (461,867) ​ ​ ​ ​ $ (805,984) ​ ​ ​ ​ $ (445,980) ​ ​ ​ ​ $ (385,533) ​ ​
​
Deduction for amounts reported in
“Option Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (635,796) ​ ​ ​ ​ $ (413,142) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (250,379) ​ ​ ​ ​ $ (185,426) ​ ​
​
Addition of fair value at fiscal year (FY)
end, of equity awards granted during the
FY that remained outstanding
​ ​ ​ $ — ​ ​ ​ ​ $ 1,211,452 ​ ​ ​ ​ $ 2,002,130 ​ ​ ​ ​ $ 1,269,313 ​ ​ ​ ​ $ 1,198,724 ​ ​ ​ ​ $ 430,770 ​ ​ ​ ​ $ 700,439 ​ ​ ​ ​ $ 499,547 ​ ​ ​ ​ $ 424,309 ​ ​
​
Addition of fair value at vesting date, of
equity awards granted during the FY that
vested during the FY
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 72,685 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 28,658 ​ ​ ​ ​ $ — ​ ​
​
Addition of change in fair value at FY end
versus prior FY end for awards granted in
prior FY that remained outstanding
​ ​ ​ $ (117,491) ​ ​ ​ ​ $ 450,092 ​ ​ ​ ​ $ (309,326) ​ ​ ​ ​ $ (441,433) ​ ​ ​ ​ $ 324,055 ​ ​ ​ ​ $ 155,472 ​ ​ ​ ​ $ (136,617) ​ ​ ​ ​ $ (201,079) ​ ​ ​ ​ $ 108,236 ​ ​
​
Addition of change in fair value at vesting
date versus prior FY end for awards
granted in prior FY that vested during the
FY
​ ​ ​ $ 1,578,106 ​ ​ ​ ​ $ 88,499 ​ ​ ​ ​ $ 153,336 ​ ​ ​ ​ $ 308,068 ​ ​ ​ ​ $ 315,216 ​ ​ ​ ​ $ 42,553 ​ ​ ​ ​ $ 83,256 ​ ​ ​ ​ $ 118,294 ​ ​ ​ ​ $ 158,272 ​ ​
​
Deduction of the fair value at the prior FY
end for awards granted in prior FY that
failed to meet their vesting conditions
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (227,170) ​ ​
​
Addition in respect of any dividends or
other earnings paid during applicable FY
prior to vesting date of underlying award
​ ​ ​ $ 17,076 ​ ​ ​ ​ $ 28,845 ​ ​ ​ ​ $ 7,850 ​ ​ ​ ​ $ 16,889 ​ ​ ​ ​ $ 15,195 ​ ​ ​ ​ $ 12,084 ​ ​ ​ ​ $ 4,039 ​ ​ ​ ​ $ 7,545 ​ ​ ​ ​ $ 6,765 ​ ​
​
SEC CAP
 ​ ​ ​ $ 5,618,723 ​ ​ ​ ​ $ 3,540,577 ​ ​ ​ ​ $ 2,698,385 ​ ​ ​ ​ $ 2,498,478 ​ ​ ​ ​ $ 3,001,054 ​ ​ ​ ​ $ 1,519,307 ​ ​ ​ ​ $ 1,098,874 ​ ​ ​ ​ $ 1,160,025 ​ ​ ​ ​ $ 1,123,128 ​ ​
   
Non-PEO NEO Average Total Compensation Amount $ 1,253,741 $ 1,340,295 $ 1,403,420 $ 1,223,674
Non-PEO NEO Average Compensation Actually Paid Amount 1,098,874 $ 1,519,307 1,160,025 1,123,128
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]  
3.
Adjustments to Total Compensation from the Summary Compensation Table to arrive at compensation actually paid pursuant to SEC rules (“SEC CAP”) to Mr. Jensen as PEO, Mr. Heissenbuttel as PEO and to our non-PEO NEOs are as detailed in Annex A to this report.
​
​ ​ ​ ​
PEO — JENSEN
 ​ ​
PEO — HEISSENBUTTEL
 ​ ​
Non-PEO NEO Average
 ​
​
Adjustments
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​ ​
2022
 ​ ​
2021 STUB
 ​ ​
2021
 ​ ​
2020
 ​
​
Summary Compensation Table Total
 ​ ​ ​ $ 4,141,033 ​ ​ ​ ​ $ 3,060,540 ​ ​ ​ ​ $ 3,148,212 ​ ​ ​ ​ $ 3,042,284 ​ ​ ​ ​ $ 2,403,556 ​ ​ ​ ​ $ 1,340,295 ​ ​ ​ ​ $ 1,253,741 ​ ​ ​ ​ $ 1,403,420 ​ ​ ​ ​ $ 1,223,674 ​ ​
​
Deduction for amount reported in “Stock
Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ (1,298,851) ​ ​ ​ ​ $ (2,303,817) ​ ​ ​ ​ $ (1,133,532) ​ ​ ​ ​ $ (842,551) ​ ​ ​ ​ $ (461,867) ​ ​ ​ ​ $ (805,984) ​ ​ ​ ​ $ (445,980) ​ ​ ​ ​ $ (385,533) ​ ​
​
Deduction for amounts reported in
“Option Awards” column of the Summary
Compensation Table
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (635,796) ​ ​ ​ ​ $ (413,142) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (250,379) ​ ​ ​ ​ $ (185,426) ​ ​
​
Addition of fair value at fiscal year (FY)
end, of equity awards granted during the
FY that remained outstanding
​ ​ ​ $ — ​ ​ ​ ​ $ 1,211,452 ​ ​ ​ ​ $ 2,002,130 ​ ​ ​ ​ $ 1,269,313 ​ ​ ​ ​ $ 1,198,724 ​ ​ ​ ​ $ 430,770 ​ ​ ​ ​ $ 700,439 ​ ​ ​ ​ $ 499,547 ​ ​ ​ ​ $ 424,309 ​ ​
​
Addition of fair value at vesting date, of
equity awards granted during the FY that
vested during the FY
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 72,685 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 28,658 ​ ​ ​ ​ $ — ​ ​
​
Addition of change in fair value at FY end
versus prior FY end for awards granted in
prior FY that remained outstanding
​ ​ ​ $ (117,491) ​ ​ ​ ​ $ 450,092 ​ ​ ​ ​ $ (309,326) ​ ​ ​ ​ $ (441,433) ​ ​ ​ ​ $ 324,055 ​ ​ ​ ​ $ 155,472 ​ ​ ​ ​ $ (136,617) ​ ​ ​ ​ $ (201,079) ​ ​ ​ ​ $ 108,236 ​ ​
​
Addition of change in fair value at vesting
date versus prior FY end for awards
granted in prior FY that vested during the
FY
​ ​ ​ $ 1,578,106 ​ ​ ​ ​ $ 88,499 ​ ​ ​ ​ $ 153,336 ​ ​ ​ ​ $ 308,068 ​ ​ ​ ​ $ 315,216 ​ ​ ​ ​ $ 42,553 ​ ​ ​ ​ $ 83,256 ​ ​ ​ ​ $ 118,294 ​ ​ ​ ​ $ 158,272 ​ ​
​
Deduction of the fair value at the prior FY
end for awards granted in prior FY that
failed to meet their vesting conditions
​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (227,170) ​ ​
​
Addition in respect of any dividends or
other earnings paid during applicable FY
prior to vesting date of underlying award
​ ​ ​ $ 17,076 ​ ​ ​ ​ $ 28,845 ​ ​ ​ ​ $ 7,850 ​ ​ ​ ​ $ 16,889 ​ ​ ​ ​ $ 15,195 ​ ​ ​ ​ $ 12,084 ​ ​ ​ ​ $ 4,039 ​ ​ ​ ​ $ 7,545 ​ ​ ​ ​ $ 6,765 ​ ​
​
SEC CAP
 ​ ​ ​ $ 5,618,723 ​ ​ ​ ​ $ 3,540,577 ​ ​ ​ ​ $ 2,698,385 ​ ​ ​ ​ $ 2,498,478 ​ ​ ​ ​ $ 3,001,054 ​ ​ ​ ​ $ 1,519,307 ​ ​ ​ ​ $ 1,098,874 ​ ​ ​ ​ $ 1,160,025 ​ ​ ​ ​ $ 1,123,128 ​ ​
   
Compensation Actually Paid vs. Total Shareholder Return [Text Block]  
[MISSING IMAGE: bc_seccaptsr-pn.jpg]
   
Compensation Actually Paid vs. Net Income [Text Block]  
[MISSING IMAGE: bc_seccapnetincome-pn.jpg]
   
Compensation Actually Paid vs. Company Selected Measure [Text Block]  
[MISSING IMAGE: bc_cashexp-pn.jpg]
   
Tabular List [Table Text Block]  
Tabular List of Company Performance Measures
The following table alphabetically lists the financial performance measures we believe were most important in linking compensation actually paid to NEOs to company performance during 2022.
​
Most Important Financial Performance Measures for 2022
​
​ Adjusted Cash G&A Expense ​
​ Net GEO Production ​
​ TSR ​
   
Total Shareholder Return Amount 105.4 $ 114.3 113.6 122.5
Peer Group Total Shareholder Return Amount 162.4 151.2 171.4 154.8
Net Income (Loss) $ 138,338,721 $ 238,981,683 $ 302,532,476 $ 199,343,108
Company Selected Measure Amount 11,944,744 25,636,590 22,657,145 21,078,698
PEO Name   Mr. Heissenbuttel    
Measure [Axis]: 1        
Pay vs Performance Disclosure [Table]        
Measure Name   Adjusted Cash G&A Expense    
Non-GAAP Measure Description [Text Block]  
5.
Adjusted Cash G&A Expense, which is a non-GAAP financial measure, is calculated as our G&A Expense less (a) non-cash employee stock compensation expense and (b) litigation expense.
​
    
Measure [Axis]: 2        
Pay vs Performance Disclosure [Table]        
Measure Name   Net GEO Production    
Measure [Axis]: 3        
Pay vs Performance Disclosure [Table]        
Measure Name   TSR    
Jensen [Member]        
Pay vs Performance Disclosure [Table]        
PEO Total Compensation Amount $ 0 $ 0 $ 0 $ 4,141,033
PEO Actually Paid Compensation Amount 0 0 0 5,618,723
Jensen [Member] | Change in fair value at FY end versus prior FY end for awards granted in prior FY that remained outstanding [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount       (117,491)
Jensen [Member] | Change in fair value at vesting date versus prior FY end for awards granted in prior FY that vested during the FY ​[Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount       1,578,106
Jensen [Member] | Dividends or other earnings paid during applicable FY prior to vesting date of underlying award [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount       17,076
Heissenbuttel [Member]        
Pay vs Performance Disclosure [Table]        
PEO Total Compensation Amount 3,148,212 3,060,540 3,042,284 2,403,556
PEO Actually Paid Compensation Amount 2,698,385 3,540,577 2,498,478 3,001,054
Heissenbuttel [Member] | Stock Awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (2,303,817) (1,298,851) (1,133,532) (842,551)
Heissenbuttel [Member] | Option Awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount     (635,796) (413,142)
Heissenbuttel [Member] | Fair value at fiscal year (FY) end, of equity awards granted during the FY that remained outstanding [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 2,002,130 1,211,452 1,269,313 1,198,724
Heissenbuttel [Member] | Fair value at vesting date, of equity awards granted during the FY that vested during the FY [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount     72,685  
Heissenbuttel [Member] | Change in fair value at FY end versus prior FY end for awards granted in prior FY that remained outstanding [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (309,326) 450,092 (441,433) 324,055
Heissenbuttel [Member] | Change in fair value at vesting date versus prior FY end for awards granted in prior FY that vested during the FY ​[Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 153,336 88,499 308,068 315,216
Heissenbuttel [Member] | Dividends or other earnings paid during applicable FY prior to vesting date of underlying award [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 7,850 28,845 16,889 15,195
Non-PEO NEO [Member] | Stock Awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (805,984) (461,867) (445,980) (385,533)
Non-PEO NEO [Member] | Option Awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount     (250,379) (185,426)
Non-PEO NEO [Member] | Fair value at fiscal year (FY) end, of equity awards granted during the FY that remained outstanding [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 700,439 430,770 499,547 424,309
Non-PEO NEO [Member] | Fair value at vesting date, of equity awards granted during the FY that vested during the FY [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount     28,658  
Non-PEO NEO [Member] | Change in fair value at FY end versus prior FY end for awards granted in prior FY that remained outstanding [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (136,617) 155,472 (201,079) 108,236
Non-PEO NEO [Member] | Change in fair value at vesting date versus prior FY end for awards granted in prior FY that vested during the FY ​[Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 83,256 42,553 118,294 158,272
Non-PEO NEO [Member] | Fair value at the prior FY end for awards granted in prior FY that failed to meet their vesting conditions [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount       (227,170)
Non-PEO NEO [Member] | Dividends or other earnings paid during applicable FY prior to vesting date of underlying award [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ 4,039 $ 12,084 $ 7,545 $ 6,765