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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
OPERATING ACTIVITIES |  |
Net income | $ 38,874 | $ 34,816
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 32,326 | 28,266
Deferred income taxes | 4,710 | (4,501)
Amortization of stock-based compensation | 622 | 1,631
Gain on disposal of property and equipment | (19,823) | (7,760)
Changes in certain working capital items: |  |
Trade receivables | (3,047) | (5,627)
Prepaid expenses and other current assets | (3,524) | (1,294)
Accounts payable, accrued liabilities, and accrued expenses | 1,244 | 2,361
Accrued income taxes | (1,049) | (4,222)
Net cash provided by operating activities | 50,333 | 43,670
INVESTING ACTIVITIES |  |
Proceeds from sale of property and equipment | 40,404 | 14,656
Purchases of property and equipment, net of trades | (77,156) | (14,032)
Maturity and calls of investments | 9,825 | 31,325
Change in other assets | 11 | 103
Net cash (used in) provided by investing activities | (26,916) | 32,052
FINANCING ACTIVITIES |  |
Payments of Dividends | (1,701) | (1,738)
Payments for Repurchase of Common Stock | 0 | (3,015)
Net cash used in financing activities | (1,701) | (4,753)
Net increase in cash and cash equivalents | 21,716 | 70,969
CASH AND CASH EQUIVALENTS |  |
Beginning of period | 119,838 | 139,770
End of period | 141,554 | 210,739
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |
Cash paid during the period for income taxes, net of refunds | 17,301 | 24,743
Noncash investing and financing activities: |  |
Purchased property and equipment in accounts payable | 214 | 902
Common Stock Dividends Declared in Accounts Payable | 1,701 | 1,735
Treasury stock acquired in accounts payable | $ 0 | $ 1,969

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