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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
OPERATING ACTIVITIES |  |  |
Net income | $ 61,541 | $ 69,932 | $ 62,216
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 57,821 | 57,876 | 61,949
Deferred income taxes | (5,751) | 14,743 | (8,440)
Amortization of stock-based compensation | 2,379 | 150 | 0
Gain on disposal of property and equipment | (15,109) | (32,133) | (13,317)
Changes in certain working capital items: |  |  |
Trade receivables | (2,357) | (2,579) | (4,258)
Prepaid expenses and other current assets | 5,688 | (6,459) | 252
Accounts payable, accrued liabilities, and accrued expenses | 953 | (952) | 1,609
Accrued income taxes | (2,992) | (1,498) | (1,404)
Net cash provided by operating activities | 102,173 | 99,080 | 98,607
INVESTING ACTIVITIES |  |  |
Proceeds from sale of property and equipment | 29,184 | 73,018 | 21,649
Purchases of property and equipment, net of trades | (66,811) | (126,257) | (14,551)
Maturity and calls of investments | 32,350 | 38,125 | 79,225
Purchases of investments | 0 | 0 | (18,000)
Change in other assets | (704) | (1,818) | (217)
Net cash (used in) provided by investing activities | (5,981) | (16,932) | 68,106
FINANCING ACTIVITIES |  |  |
Cash dividends | (91,934) | (7,148) | (97,944)
Repurchases of common stock | (24,190) | (56,350) | 0
Net cash used in financing activities | (116,124) | (63,498) | (97,944)
Net (decrease) increase in cash and cash equivalents | (19,932) | 18,650 | 68,769
CASH AND CASH EQUIVALENTS |  |  |
Beginning of period | 139,770 | 121,120 | 52,351
End of period | 119,838 | 139,770 | 121,120
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |  |
Cash paid during the period for income taxes, net of refunds | 42,776 | 24,152 | 40,502
Noncash investing and financing activities: |  |  |
Fair value of revenue equipment traded | 0 | 0 | 14,604
Purchased property and equipment in accounts payable | $ 698 | $ 1,683 | $ 1,190

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