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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets and liabilities measured at fair value on a recurring basis | ||||||||||||
| Cash equivalents | $ 85,663 | $ 97,751 | $ 90,093 | |||||||||
| Restricted cash | 173 | 408 | 164 | |||||||||
| Commodity derivatives, net | (126,689) | [1] | 967 | [1] | 7,525 | [1] | ||||||
| Convertible preferred securities | 15,000 | [2] | 25,720 | [2] | 17,710 | [2] | ||||||
| Other assets and liabilities | 9,035 | [3] | 9,984 | [3] | 8,494 | [3] | ||||||
| Total | (16,818) | 134,830 | 123,986 | |||||||||
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Level 1
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| Assets and liabilities measured at fair value on a recurring basis | ||||||||||||
| Cash equivalents | 85,663 | 97,751 | 90,093 | |||||||||
| Restricted cash | 173 | 408 | 164 | |||||||||
| Commodity derivatives, net | 32,606 | [1] | 50,777 | [1] | 62,560 | [1] | ||||||
| Convertible preferred securities | 0 | [2] | 0 | [2] | 0 | [2] | ||||||
| Other assets and liabilities | 10,671 | [3] | 10,143 | [3] | 9,539 | [3] | ||||||
| Total | 129,113 | 159,079 | 162,356 | |||||||||
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Level 2
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| Assets and liabilities measured at fair value on a recurring basis | ||||||||||||
| Cash equivalents | 0 | 0 | 0 | |||||||||
| Restricted cash | 0 | 0 | 0 | |||||||||
| Commodity derivatives, net | (159,295) | [1] | (49,810) | [1] | (55,035) | [1] | ||||||
| Convertible preferred securities | 0 | [2] | 0 | [2] | 0 | [2] | ||||||
| Other assets and liabilities | (1,636) | [3] | (159) | [3] | (1,045) | [3] | ||||||
| Total | (160,931) | (49,969) | (56,080) | |||||||||
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Level 3
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| Assets and liabilities measured at fair value on a recurring basis | ||||||||||||
| Cash equivalents | 0 | 0 | 0 | |||||||||
| Restricted cash | 0 | 0 | 0 | |||||||||
| Commodity derivatives, net | 0 | [1] | 0 | [1] | 0 | [1] | ||||||
| Convertible preferred securities | 15,000 | [2] | 25,720 | [2] | 17,710 | [2] | ||||||
| Other assets and liabilities | 0 | [3] | 0 | [3] | 0 | [3] | ||||||
| Total | $ 15,000 | $ 25,720 | $ 17,710 | |||||||||
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