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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 68,067 | $ 69,252 | $ 70,434 | $ 55,000 | $ 56,603 | $ 60,537 | $ 66,325 | $ 65,461 | $ 262,753 | $ 248,926 | $ 229,254
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  |  |  |  |  |  |  | 26,703 | 24,308 | 20,897
Production taxes |  |  |  |  |  |  |  |  | 26,933 | 28,957 | 26,054
Midstream transportation, processing and marketing |  |  |  |  |  |  |  |  | 11,030 | 443 | 279
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 118,880 | 90,749 | 62,320
General and administrative |  |  |  |  |  |  |  |  | 22,519 | 13,808 | 8,074
(Gain) loss on sale of assets |  |  |  |  |  |  |  |  | 508 | (7,300) | 0
Accretion expense |  |  |  |  |  |  |  |  | 717 | 698 | 666
Total costs and expenses |  |  |  |  |  |  |  |  | 207,290 | 151,663 | 118,290
INCOME FROM OPERATIONS | 2,926 | 15,137 | 22,456 | 14,944 | 25,875 | 18,178 | 25,947 | 27,263 | 55,463 | 97,263 | 110,964
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 17,490 | 7,458 | 1,400
Interest income |  |  |  |  |  |  |  |  | (297) | (72) | (186)
(Income) loss from equity method investments |  |  |  |  |  |  |  |  | (213,058) | (8,322) | 1,418
Total Other (Income) Expense |  |  |  |  |  |  |  |  | (195,865) | (936) | 2,632
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 251,328 | 98,199 | 108,332
INCOME TAX EXPENSE (BENEFIT) | 21,027 | 23,400 | 25,514 | 28,195 | 10,849 | 15,514 | 0 | 0 | 98,136 | 26,363 | (90)
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  | 153,192 | 71,836 | 108,422
Loss on disposal of Belize properties, net of tax |  |  |  |  |  |  |  |  | 0 | 3,465 | 0
NET INCOME | 24,278 | 40,527 | 43,828 | 44,559 | 15,883 | 502 | 25,117 | 26,869 | 153,192 | 68,371 | 108,422
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 261,809 | 247,637 | 228,281
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  |  |  |  |  |  |  | 25,971 | 23,644 | 20,168
Production taxes |  |  |  |  |  |  |  |  | 26,848 | 28,874 | 25,991
Midstream transportation, processing and marketing |  |  |  |  |  |  |  |  | 10,999 | 432 | 275
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 118,878 | 90,749 | 62,320
General and administrative |  |  |  |  |  |  |  |  | 22,359 | 13,602 | 8,038
(Gain) loss on sale of assets |  |  |  |  |  |  |  |  | 508 | (7,300) |
Accretion expense |  |  |  |  |  |  |  |  | 717 | 698 | 666
Total costs and expenses |  |  |  |  |  |  |  |  | 206,280 | 150,699 | 117,458
INCOME FROM OPERATIONS |  |  |  |  |  |  |  |  | 55,529 | 96,938 | 110,823
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 17,490 | 7,458 | 1,400
Interest income |  |  |  |  |  |  |  |  | (297) | (72) | (39)
(Income) loss from equity method investments |  |  |  |  |  |  |  |  | (212,992) | (5,182) | 1,130
Total Other (Income) Expense |  |  |  |  |  |  |  |  | (195,799) | 2,204 | 2,491
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 251,328 | 94,734 | 108,332
INCOME TAX EXPENSE (BENEFIT) |  |  |  |  |  |  |  |  | 98,136 | 26,363 | (90)
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 68,371 |
Loss on disposal of Belize properties, net of tax |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME |  |  |  |  |  |  |  |  | 153,192 | 68,371 | 108,422
Guarantor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,517 | 1,289 | 973
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  |  |  |  |  |  |  | 732 | 664 | 729
Production taxes |  |  |  |  |  |  |  |  | 85 | 83 | 63
Midstream transportation, processing and marketing |  |  |  |  |  |  |  |  | 31 | 11 | 4
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 2 | 0 | 0
General and administrative |  |  |  |  |  |  |  |  | 159 | 132 | 11
(Gain) loss on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 |
Accretion expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  | 1,009 | 890 | 807
INCOME FROM OPERATIONS |  |  |  |  |  |  |  |  | 508 | 399 | 166
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Income) loss from equity method investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Other (Income) Expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 508 | 399 | 166
INCOME TAX EXPENSE (BENEFIT) |  |  |  |  |  |  |  |  | 0 | 0 | 0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 399 |
Loss on disposal of Belize properties, net of tax |  |  |  |  |  |  |  |  |  | 3,465 |
NET INCOME |  |  |  |  |  |  |  |  | 508 | (3,066) | 166
Non-Guarantor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Production taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Midstream transportation, processing and marketing |  |  |  |  |  |  |  |  | 0 |  | 0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative |  |  |  |  |  |  |  |  | 1 | 74 | 25
(Gain) loss on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 |
Accretion expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  | 1 | 74 | 25
INCOME FROM OPERATIONS |  |  |  |  |  |  |  |  | (1) | (74) | (25)
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | (147)
(Income) loss from equity method investments |  |  |  |  |  |  |  |  | 2,999 | 1,512 | 1,592
Total Other (Income) Expense |  |  |  |  |  |  |  |  | 2,999 | 1,512 | 1,445
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | (3,000) | (1,586) | (1,470)
INCOME TAX EXPENSE (BENEFIT) |  |  |  |  |  |  |  |  | 0 | 0 | 0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | (1,586) |
Loss on disposal of Belize properties, net of tax |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME |  |  |  |  |  |  |  |  | (3,000) | (1,586) | (1,470)
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (573) | 0 | 0
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Production taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Midstream transportation, processing and marketing |  |  |  |  |  |  |  |  | 0 |  | 0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Gain) loss on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 |
Accretion expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
INCOME FROM OPERATIONS |  |  |  |  |  |  |  |  | (573) | 0 | 0
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Income) loss from equity method investments |  |  |  |  |  |  |  |  | (3,065) | (4,652) | (1,304)
Total Other (Income) Expense |  |  |  |  |  |  |  |  | (3,065) | (4,652) | (1,304)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 2,492 | 4,652 | 1,304
INCOME TAX EXPENSE (BENEFIT) |  |  |  |  |  |  |  |  | 0 | 0 | 0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 4,652 |
Loss on disposal of Belize properties, net of tax |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME |  |  |  |  |  |  |  |  | $ 2,492 | $ 4,652 | $ 1,304

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