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Supplemental Oil and Gas Disclosures (Tables)
 12 Months Ended
Dec. 31, 2012
Oil And Gas Exploration And Production Industries Disclosures [Abstract]  
Capitalized Costs Relating To Oil And Gas Producing Activities Disclosure [Table Text Block]
Capitalized Costs Relating to Oil and Gas Producing Activities
     United Kingdom United States Total
December 31, 2012:      
 Proved$ 876,536$ 39,265$ 915,801
 Unproved  273,298  76,135  349,433
 Total capitalized costs  1,149,834  115,400  1,265,234
          
 Accumulated depreciation, depletion and amortization  (241,338)  (24,269)  (265,607)
          
 Net capitalized costs$ 908,496$ 91,131$ 999,627
          
December 31, 2011:      
 Proved$ 429,246$ 67,421$ 496,667
 Unproved  183,110  75,224  258,334
 Total capitalized costs  612,356  142,645  755,001
          
 Accumulated depreciation, depletion and amortization  (192,027)  (16,735)  (208,762)
          
 Net capitalized costs$ 420,329$ 125,910$ 546,239
Cost Incurred In Oil And Gas Property Acquisition Exploration And Development Activities Disclosure [Text Block]
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities
    United Kingdom United States Total
Year Ended December 31, 2012:    
 Acquisition costs:      
  Proved$ 143,004$ 1,176$ 144,180
  Unproved  46,878  1,156  48,034
 Exploration costs  46,730  15,397  62,127
 Development costs  302,038  8,099  310,137
Total costs incurred$ 538,650$ 25,828$ 564,478
         
Year Ended December 31, 2011:    
 Acquisition costs:      
  Proved$ 2,595$ -$ 2,595
  Unproved  46,107  2,840  48,947
 Exploration costs  51,820  75,880  127,700
 Development costs  79,898  10,560  90,458
Total costs incurred$ 180,420$ 89,280$ 269,700
     
Year Ended December 31, 2010:    
 Acquisition costs:      
  Proved$ -$ 2,386$ 2,386
  Unproved  1,184  40,155  41,339
 Exploration costs  50,328  32,027  82,355
 Development costs  22,047  1,884  23,931
Total costs incurred$ 73,559$ 76,452$ 150,011
Results Of Operations For Oil And Gas Producing Activities Disclosure [Text Block]
Results of Operations for Oil and Gas Producing Activities
    United Kingdom United States Total
Year Ended December 31, 2012:    
 Revenues$ 207,181$ 11,877$ 219,058
 Production expenses  51,568  6,968  58,536
 DD&A  56,813  7,574  64,387
 Impairment of oil and gas properties  -  53,072  53,072
 Income tax expense (benefit)  61,256  (19,508)  41,748
 Results of activities$ 37,544$ (36,229)$ 1,315
     
Year Ended December 31, 2011:   
 Revenues$ 41,754$ 18,337$ 60,091
 Production expenses  8,622  9,046  17,668
 DD&A  14,312  10,713  25,025
 Impairment of oil and gas properties  -  65,706  65,706
 Income tax expense (benefit)  11,104  (23,495)  (12,391)
 Results of activities$ 7,716$ (43,633)$ (35,917)
         
Year Ended December 31, 2010:    
 Revenues$ 60,501$ 11,174$ 71,675
 Production expenses  11,086  4,261  15,347
 DD&A  22,020  5,273  27,293
 Impairment of oil and gas properties  -  7,692  7,692
 Income tax expense (benefit)  13,698  (2,118)  11,580
 Results of activities$ 13,697$ (3,934)$ 9,763
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table Text Block]
  United KingdomUnited StatesTotal
Proved Oil Reserves (MBbls):   
 Proved reserves at January 1, 2010 3,348 18 3,366
 Production (545) (6) (551)
 Extensions and discoveries 457 34 491
 Revisions of previous estimates 404 13 417
 Proved reserves at December 31, 2010 3,664 59 3,723
 Production (373) (7) (380)
 Purchases of reserves 303 - 303
 Revisions of previous estimates 466 (11) 455
 Proved reserves at December 31, 2011 4,060 41 4,101
 Production (1,994) (3) (1,997)
 Purchases of reserves 11,071 - 11,071
 Sales of reserves in place - (19) (19)
 Extensions and discoveries 1,992 - 1,992
 Revisions of previous estimates (1,396) (13) (1,409)
 Proved reserves at December 31, 2012 13,733 6 13,739
     
Proved Developed Oil Reserves (MBbls):   
 At December 31, 2010 1,240 14 1,254
 At December 31, 2011 1,270 41 1,311
 At December 31, 2012 5,261 6 5,267

  United KingdomUnited StatesTotal
Proved Gas Reserves (MMcf):   
 Proved reserves at January 1, 2010 78,316 10,784 89,100
 Production (3,071) (2,636) (5,707)
 Purchases of reserves - 2,657 2,657
 Sales of reserves in place (51,522) - (51,522)
 Extensions and discoveries 26,692 24,181 50,873
 Revisions of previous estimates 5,762 (3,209) 2,553
 Proved reserves at December 31, 2010 56,177 31,777 87,954
 Production (94) (5,076) (5,170)
 Purchases of reserves 90 - 90
 Extensions and discoveries - 46,100 46,100
 Revisions of previous estimates (5,450) (11,823) (17,273)
 Proved reserves at December 31, 2011 50,723 60,978 111,701
 Production (91) (5,206) (5,297)
 Purchases of reserves 1,409 998 2,407
 Sales of reserves in place - (5,213) (5,213)
 Extensions and discoveries 473 - 473
 Revisions of previous estimates 4,387 (36,867) (32,480)
 Proved reserves at December 31, 2012 56,901 14,690 71,591
     
Proved Developed Gas Reserves (MMcf):   
 At December 31, 2010 555 13,281 13,836
 At December 31, 2011 795 22,704 23,499
 At December 31, 2012 3,147 14,690 17,837

  United KingdomUnited StatesTotal
     
Proved Reserves (MBOE):   
 Proved reserves at January 1, 2010 16,401 1,815 18,216
 Production (1,057) (445) (1,502)
 Extensions and discoveries 4,906 4,064 8,970
 Purchase of proved reserves, in place - 443 443
 Sales of reserves (8,587) - (8,587)
 Revisions of previous estimates 1,364 (522) 842
 Proved reserves at December 31, 2010 13,027 5,355 18,382
 Production (389) (853) (1,242)
 Extensions and discoveries - 7,683 7,683
 Purchase of proved reserves, in place 318 - 318
 Revisions of previous estimates (442) (1,981) (2,423)
 Proved reserves at December 31, 2011 12,514 10,204 22,718
 Production (2,009) (871) (2,880)
 Extensions and discoveries 2,071 - 2,071
 Purchase of proved reserves, in place 11,306 166 11,472
 Sale of reserves - (888) (888)
 Revisions of previous estimates (665) (6,157) (6,822)
     
 Proved reserves at December 31, 2012 23,217 2,454 25,671
     
Proved Developed Reserves (MBOE):   
 At December 31, 2010 1,333 2,227 3,560
 At December 31, 2011 1,402 3,825 5,227
 At December 31, 2012 5,785 2,454 8,239
Prices Used To Determine Estimates Of Future Cash Inflows Table [Text Block]
 December 31,
 2012 2011
 OilGas OilGas
      
United Kingdom ($/Barrel) 111.13 9.34  110.77 8.75
United States ($/Mcf) 94.71 2.75  96.04 4.14
Schedule Of Changes In Standardized Measure Of DiscountedFuture Net Cash Flows[Table Text Block]
Standardized Measure of Discounted Future Net Cash Flows
   United Kingdom United States Total
December 31, 2012:      
 Future cash inflows$ 2,035,208$ 31,258$ 2,066,466
 Future production costs  (568,414)  (10,101)  (578,515)
 Future development costs  (581,277)  (896)  (582,173)
 Future income tax expense  (277,436)  -  (277,436)
        
 Future net cash flows (undiscounted)  608,081  20,261  628,342
 Annual discount of 10% for estimated timing  122,780  6,584  129,364
        
 Standardized measure of future net cash flows$ 485,301$ 13,677$ 498,978
        
December 31, 2011:      
 Future cash inflows$ 941,208$ 218,295$ 1,159,503
 Future production costs  (144,106)  (47,344)  (191,450)
 Future development costs  (306,628)  (64,757)  (371,385)
 Future income tax expense  (238,111)  -  (238,111)
        
 Future net cash flows (undiscounted)  252,363  106,194  358,557
 Annual discount of 10% for estimated timing  37,250  56,435  93,685
        
 Standardized measure of future net cash flows$ 215,113$ 49,759$ 264,872

Principal Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows
  2012 2011 2010
       
Standardized measure, beginning of period$ 264,872$ 111,297$ 55,698
Net changes in prices and production costs  (33,520)  147,776  86,915
Future development costs incurred  172,462  76,721  21,112
Net changes in estimated future development costs  (193,359)  (9,261)  (48,356)
Revisions of previous quantity estimates  (56,525)  (36,421)  16,375
Extensions and discoveries  102,386  68,452  110,059
Accretion of discount  42,589  18,801  2,630
Changes in income taxes, net  (74,778)  (136,157)  (35,306)
Sale of oil and gas produced, net of production costs  (165,547)  (44,556)  (56,327)
Purchased reserves  457,033  26,340  2,386
Sales of reserves in place  (6,971)  -  (48,310)
Change in production, timing and other  (9,664)  41,880  4,421
       
Standardized measure, end of period$ 498,978$ 264,872$ 111,297