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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Cash flows from operating activities: |  |
Net income | $ 88,387 | $ 51,986
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Accretion of discount—Asset Retirement Obligation | 349 | 353
Depletion, depreciation and amortization | 51,123 | 45,047
Stock-based compensation expense | 1,803 | 1,362
(Gain) loss from equity investments | (111,113) | 628
Interest income - note receivable |  | (1)
Unrealized gain on derivative instruments | (5,354) | (79)
Deferred income tax expense | 53,709 | 0
Amortization of loan commitment fees | 505 | 252
Amortization of note discount and premium | 145 | 0
Changes in operating assets and liabilities: |  |
(Increase) decrease in accounts receivable | (5,183) | 4,750
Increase in accounts receivable—related party | (1,975) | (22,451)
Increase in prepaid expenses | (1,133) | (1,809)
Increase in accounts payable and accrued liabilities | 3,089 | 20,461
Settlement of asset retirement obligation | (807) | (1,002)
Net cash provided by operating activities | 73,545 | 99,497
Cash flows from investing activities: |  |
Deductions to cash held in escrow | 8 | 8
Additions to other property and equipment | (355) | (503)
Additions to oil and gas properties | (428,234) | (150,653)
Proceeds from sale of other property and equipment | 0 | 140
Advances on note receivable to related party |  | (1,594)
Proceeds from sale of investments | 65,111 | 0
Contributions to equity method investments | (21,960) | (101,864)
Distributions from equity method investments | 901 | 200
Net cash used in investing activities | (384,529) | (254,266)
Cash flows from financing activities: |  |
Principal payments on borrowings | (73) | (12,066)
Borrowings on line of credit |  | 80,000
Debt issuance costs and loan commitment fees | (686) | (449)
Proceeds from issuance of common stock, net of offering costs | 359,040 |
Net cash provided by financing activities | 358,281 | 67,485
Net increase (decrease) in cash and cash equivalents | 47,297 | (87,284)
Cash and cash equivalents at beginning of period | 167,088 | 93,897
Cash and cash equivalents at end of period | 214,385 | 6,613
Supplemental disclosure of cash flow information: |  |
Interest payments | 12,594 | 237
Income tax payments | 750 | 255
Supplemental disclosure of non-cash transactions: |  |
Capitalized stock based compensation | 1,201 | 908
Asset retirement obligation capitalized | 1,194 | 1,176
Interest capitalized | 5,497 | 0
Foreign currency translation gain (loss) on investment in Grizzly Oil Sands ULC | $ (9,680) | $ (1,926)

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- Definition The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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