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CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 43,072 | $ 5,339 | $ 40,562
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation, depletion and amortization | 16,929 | 19,913 | 25,596
Unrealized foreign exchange (gain) loss | 22 | (245) | 25
Dry hole costs and impairment loss on unproved leasehold | 22,490 | 37,289 | 60
Stock based compensation | 3,005 | 2,406 | 2,217
Bad debt provision | 1,562 | 1,621 | 4,448
Impairment of proved properties |  | 7,620 | 4,975
Gain on disposal of assets |  |  | 4
Change in operating assets and liabilities: |  |  |
Trade receivables | (9,011) | 2,126 | 3,981
Accounts with partners | (12,649) | 18,988 | 5,171
Other receivables | (53) | (199) | 5,560
Crude oil inventory | 279 | (71) | 176
Materials and supplies | 173 | (102) | 266
Other long term assets |  |  |
Prepayments and other | 594 | (766) | (886)
Accounts payable and other liabilities | 8,988 | 39 | (2,570)
Net cash provided by operating activities | 75,401 | 93,958 | 89,585
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Decrease/(increase) in restricted cash | (1,065) | 78 | 3,597
Property and equipment expenditures | (66,879) | (71,915) | (31,973)
Net cash used in investing activities | (67,944) | (71,837) | (28,376)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from the issuance of common stock | 3,729 | 3,335 | 1,888
Purchase of treasury stock | (11,456) |  |
Distribution to noncontrolling interest |  | (5,595) | (7,192)
Acquisition of noncontrolling interest |  | (26,200) |
Net cash used in financing activities | (7,727) | (28,460) | (5,304)
NET CHANGE IN CASH AND CASH EQUIVALENTS | (270) | (6,339) | 55,905
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 130,800 | 137,139 | 81,234
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 130,529 | 130,800 | 137,139
Supplemental disclosure of cash flow information |  |  |
Cash paid for Income taxes | 34,444 | 83,306 | 92,275
Supplemental disclosure of non cash investing and financing activities |  |  |
Property and equipment additions incurred during the period but not paid at period end | 13,440 | 9,814 | 6,450
Receivable from employees for stock option exercise |  | $ 173 |

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