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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
OPERATING ACTIVITIES |  |  |
Net income | $ 69,932 | $ 62,216 | $ 56,949
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 57,876 | 61,949 | 58,730
Deferred income taxes | 14,743 | (8,440) | 14,637
Amortization of stock-based compensation | 150 | 0 | 0
Gain on disposal of property and equipment | (32,133) | (13,317) | (19,708)
Changes in certain working capital items: |  |  |
Trade receivables | (2,579) | (4,258) | (558)
Prepaid expenses and other current assets | (6,459) | 252 | 671
Accounts payable, accrued liabilities, and accrued expenses | (952) | 1,609 | (567)
Accrued income taxes | (1,498) | (1,404) | (9,051)
Net cash provided by operating activities | 99,080 | 98,607 | 101,103
INVESTING ACTIVITIES |  |  |
Proceeds from sale of property and equipment | 73,018 | 21,649 | 11
Purchases of property and equipment, net of trades | (126,257) | (14,551) | (79,123)
Maturity and calls of investments | 38,125 | 79,225 | 27,000
Purchases of investments | 0 | (18,000) | (350)
Change in other assets | (1,818) | (217) | (311)
Net cash (used in) provided by investing activities | (16,932) | 68,106 | (52,773)
FINANCING ACTIVITIES |  |  |
Cash dividends | (7,148) | (97,944) | (7,270)
Repurchases of common stock | (56,350) | 0 | (45,360)
Net cash used in financing activities | (63,498) | (97,944) | (52,630)
Net increase in cash and cash equivalents | 18,650 | 68,769 | (4,300)
CASH AND CASH EQUIVALENTS |  |  |
Beginning of period | 121,120 | 52,351 | 56,651
End of period | 139,770 | 121,120 | 52,351
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |  |
Cash paid during the period for income taxes, net of refunds | 24,152 | 40,502 | 18,767
Noncash investing and financing activities: |  |  |
Fair value of revenue equipment traded | 0 | 14,604 | 60,645
Purchased property and equipment in accounts payable | $ 1,683 | $ 1,190 | $ 178

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