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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 55,000 | $ 56,603 | $ 60,537 | $ 66,325 | $ 65,461 | $ 68,946 | $ 58,081 | $ 55,589 | $ 46,638 | $ 248,926 | $ 229,254 | $ 127,921
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses | 5,172 |  |  |  | 5,849 |  |  |  |  | 24,308 | 20,897 | 17,614
Production taxes | 7,287 |  |  |  | 7,769 |  |  |  |  | 29,400 | 26,333 | 13,966
Depletion, depreciation and amortization | 22,583 |  |  |  | 21,395 |  |  |  |  | 90,749 | 62,320 | 38,907
General and administrative | 4,412 |  |  |  | 3,009 |  |  |  |  | 13,808 | 8,074 | 6,063
Accretion expense | 175 |  |  |  | 176 |  |  |  |  | 698 | 666 | 617
(Gain) Loss on sale of asset | 427 |  |  |  | 0 |  |  |  |  | (7,300) | 0 | 0
Total Costs and Expenses | 40,056 |  |  |  | 38,198 |  |  |  |  | 151,663 | 118,290 | 77,167
INCOME FROM OPERATIONS | 14,944 | 25,875 | 18,178 | 25,947 | 27,263 | 31,585 | 29,118 | 28,156 | 22,105 | 97,263 | 110,964 | 50,754
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 3,479 |  |  |  | 153 |  |  |  |  | 7,458 | 1,400 | 2,761
Interest income | (79) |  |  |  | (27) |  |  |  |  | (72) | (186) | (387)
(Income) loss from equity method investments | (61,210) |  |  |  | 268 |  |  |  |  | (8,322) | 1,418 | 977
Total Other (Income) Expense | (57,810) |  |  |  | 394 |  |  |  |  | (936) | 2,632 | 3,351
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 72,754 |  |  |  | 26,869 |  |  |  |  | 98,199 | 108,332 | 47,403
INCOME TAX EXPENSE (BENEFIT) | 28,195 | 10,849 | 15,514 | 0 | 0 | (91) | 0 | 1 | 0 | 26,363 | (90) | 40
INCOME (LOSS) FROM CONTINUING OPERATIONS | 44,559 |  |  |  | 26,869 |  |  |  |  | 71,836 | 108,422 | 47,363
Discontinued Operations |  |  |  |  |  |  |  |  |  | 3,465 | 0 | 0
NET INCOME | 44,559 | 15,883 | 502 | 25,117 | 26,869 | 30,974 | 29,009 | 27,265 | 21,174 | 68,371 | 108,422 | 47,363
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 54,662 |  |  |  | 65,165 |  |  |  |  | 247,637 | 228,281 | 127,380
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses | 4,998 |  |  |  | 5,645 |  |  |  |  | 23,644 | 20,168 | 17,043
Production taxes | 7,261 |  |  |  | 7,747 |  |  |  |  | 29,306 | 26,266 | 13,929
Depletion, depreciation and amortization | 22,583 |  |  |  | 21,395 |  |  |  |  | 90,749 | 62,320 | 38,902
General and administrative | 4,378 |  |  |  | 2,964 |  |  |  |  | 13,602 | 8,038 | 6,037
Accretion expense | 175 |  |  |  | 176 |  |  |  |  | 698 | 666 | 617
(Gain) Loss on sale of asset | 427 |  |  |  |  |  |  |  |  | (7,300) |  |
Total Costs and Expenses | 39,822 |  |  |  | 37,927 |  |  |  |  | 150,699 | 117,458 | 76,528
INCOME FROM OPERATIONS | 14,840 |  |  |  | 27,238 |  |  |  |  | 96,938 | 110,823 | 50,852
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 3,479 |  |  |  | 153 |  |  |  |  | 7,458 | 1,400 | 2,761
Interest income | (79) |  |  |  | (27) |  |  |  |  | (72) | (39) | (120)
(Income) loss from equity method investments | (61,314) |  |  |  | 243 |  |  |  |  | (5,182) | 1,130 | 808
Total Other (Income) Expense | (57,914) |  |  |  | 369 |  |  |  |  | 2,204 | 2,491 | 3,449
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 72,754 |  |  |  | 26,869 |  |  |  |  | 94,734 | 108,332 | 47,403
INCOME TAX EXPENSE (BENEFIT) | 28,195 |  |  |  | 0 |  |  |  |  | 26,363 | (90) | 40
INCOME (LOSS) FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 68,371 |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  | 0 |  |
NET INCOME | 44,559 |  |  |  | 26,869 |  |  |  |  | 68,371 | 108,422 | 47,363
Guarantor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 338 |  |  |  | 296 |  |  |  |  | 1,289 | 973 | 541
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses | 174 |  |  |  | 204 |  |  |  |  | 664 | 729 | 571
Production taxes | 26 |  |  |  | 22 |  |  |  |  | 94 | 67 | 37
Depletion, depreciation and amortization | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 5
General and administrative | 34 |  |  |  | 20 |  |  |  |  | 132 | 11 | 24
Accretion expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
(Gain) Loss on sale of asset | 0 |  |  |  |  |  |  |  |  | 0 |  |
Total Costs and Expenses | 234 |  |  |  | 246 |  |  |  |  | 890 | 807 | 637
INCOME FROM OPERATIONS | 104 |  |  |  | 50 |  |  |  |  | 399 | 166 | (96)
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Interest income | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
(Income) loss from equity method investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Total Other (Income) Expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 104 |  |  |  | 50 |  |  |  |  | 399 | 166 | (96)
INCOME TAX EXPENSE (BENEFIT) | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
INCOME (LOSS) FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 399 |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  | 3,465 |  |
NET INCOME | 104 |  |  |  | 50 |  |  |  |  | (3,066) | 166 | (96)
Non-Guarantor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Production taxes | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Depletion, depreciation and amortization | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General and administrative | 0 |  |  |  | 25 |  |  |  |  | 74 | 25 | 2
Accretion expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
(Gain) Loss on sale of asset | 0 |  |  |  |  |  |  |  |  | 0 |  |
Total Costs and Expenses | 0 |  |  |  | 25 |  |  |  |  | 74 | 25 | 2
INCOME FROM OPERATIONS | 0 |  |  |  | (25) |  |  |  |  | (74) | (25) | (2)
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Interest income | 0 |  |  |  | 0 |  |  |  |  | 0 | (147) | (267)
(Income) loss from equity method investments | 532 |  |  |  | 278 |  |  |  |  | 1,512 | 1,592 | 740
Total Other (Income) Expense | 532 |  |  |  | 278 |  |  |  |  | 1,512 | 1,445 | 473
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | (532) |  |  |  | (303) |  |  |  |  | (1,586) | (1,470) | (475)
INCOME TAX EXPENSE (BENEFIT) | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
INCOME (LOSS) FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | (1,586) |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  | 0 |  |
NET INCOME | (532) |  |  |  | (303) |  |  |  |  | (1,586) | (1,470) | (475)
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Production taxes | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Depletion, depreciation and amortization | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General and administrative | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Accretion expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
(Gain) Loss on sale of asset | 0 |  |  |  |  |  |  |  |  | 0 |  |
Total Costs and Expenses | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
INCOME FROM OPERATIONS | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Interest income | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
(Income) loss from equity method investments | (428) |  |  |  | (253) |  |  |  |  | (4,652) | (1,304) | (571)
Total Other (Income) Expense | (428) |  |  |  | (253) |  |  |  |  | (4,652) | (1,304) | (571)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 428 |  |  |  | 253 |  |  |  |  | 4,652 | 1,304 | 571
INCOME TAX EXPENSE (BENEFIT) | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
INCOME (LOSS) FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 4,652 |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  | 0 |  |
NET INCOME | $ 428 |  |  |  | $ 253 |  |  |  |  | $ 4,652 | $ 1,304 | $ 571

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