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Fair Value Measurements (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016
Liabilities: |  |  |
Asset retirement obligation capitalized | $ 3,195 | $ 4,077 |
Level 1 |  |  |
Assets: |  |  |
Derivative Instruments | 0 |  |
Liabilities: |  |  |
Derivative Instruments | 0 |  |
Level 2 |  |  |
Assets: |  |  |
Derivative Instruments | 59,316 |  |
Liabilities: |  |  |
Derivative Instruments | 79,175 |  |
Level 3 |  |  |
Assets: |  |  |
Derivative Instruments | 0 |  |
Liabilities: |  |  |
Derivative Instruments | 0 |  |
Asset retirement obligation capitalized | $ 3,200 |  |
Level 3 | Investment in Grizzly Oil Sands ULC |  |  |
Liabilities: |  |  |
Equity investment |  |  | $ 39,100

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