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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net income | $ 54,026 | $ 154,461 | $ 114,080
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, depletion and amortization | 65,118 | 56,978 | 60,012
Non-cash interest charge | 625 | 540 | 1,463
Non-cash gain on reserve swap | (2,990) |  |
Gain on sale of assets | (1,058) |  |
Asset impairment | 161,336 |  |
Non-controlling interest | 998 | 5,065 |
Change in operating assets and liabilities: |  |  |
Accounts receivable | (6,951) | (2,627) | 581
Other assets | 90 | (27) | (67)
Accounts payable and accrued liabilities | 854 | 468 | (133)
Accrued interest | 950 | (489) | 3,850
Deferred revenue | 31,277 | 42,491 | 26,264
Accrued incentive plan expenses | 1,909 | 6,137 | 4,577
Property, franchise and other taxes payable | (610) | 762 | 42
Net cash provided by operating activities | 305,574 | 258,694 | 210,669
Cash flows from investing activities: |  |  |
Acquisition of land, coal, other mineral rights and related intangibles | (120,184) | (166,382) | (118,754)
Acquisition or construction of plant and equipment | (404) | (5,994) | (1,157)
Proceeds from sale of assets | 5,500 | 1,580 |
Net cash used in investing activities | (115,088) | (170,796) | (119,911)
Cash flows from financing activities: |  |  |
Proceeds from loans | 385,000 | 140,000 | 331,000
Proceeds from issuance of units |  | 110,436 |
Deferred financing costs | (2,957) |  | (661)
Repayments of loans | (210,519) | (106,234) | (168,235)
Payment of obligation related to acquisitions | (7,625) | (9,169) | (72,000)
Costs associated with equity transactions | (141) | (219) | (21)
Fees associated with elimination of IDRs |  | (2,341) |
Distributions | (234,828) | (209,849) | (188,135)
Contributions by general partner |  | 2,350 |
Net cash used in financing activities | (71,070) | (75,026) | (98,052)
Net increase (decrease) in cash and cash equivalents | 119,416 | 12,872 | (7,294)
Cash and cash equivalents at beginning of period | 95,506 | 82,634 | 89,928
Cash and cash equivalents at end of period | 214,922 | 95,506 | 82,634
Supplemental cash flow information: |  |  |
Cash paid during the period for interest | 47,653 | 41,565 | 34,710
Non-cash investing activities: |  |  |
Equity issued for acquisitions |  |  | 95,910
Assets contributed by general partner for acquisitions |  |  | 1,981
Liability assumed in acquisitions |  | 1,593 | 1,170
Non-controlling interest | 373 | (5,065) |
Non-cash financing activities: |  |  |
Purchase obligation related to reserve and infrastructure acquisitions | $ 500 | $ 6,200 | $ 74,022

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