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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
OPERATING ACTIVITIES |  |
Net income | $ 54,740 | $ 47,249
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 47,609 | 42,681
Deferred income taxes | 5,325 | (9,066)
Amortization of stock-based compensation | 806 | 2,000
Gain on disposal of property and equipment | (24,299) | (9,433)
Changes in certain working capital items: |  |
Trade receivables | (1,557) | (6,558)
Prepaid expenses and other current assets | (2,439) | 2,111
Accounts payable, accrued liabilities, and accrued expenses | (1,810) | 2,257
Accrued income taxes | (5,182) | (3,736)
Net cash provided by operating activities | 73,193 | 67,505
INVESTING ACTIVITIES |  |
Proceeds from sale of property and equipment | 56,751 | 17,449
Purchases of property and equipment, net of trades | (91,845) | (25,360)
Maturity and calls of investments | 9,875 | 31,325
Change in other assets | (195) | (4)
Net cash (used in) provided by investing activities | (25,414) | 23,410
FINANCING ACTIVITIES |  |
Payments of Dividends | (3,402) | (3,472)
Payments for Repurchase of Common Stock | 0 | (14,472)
Net cash used in financing activities | (3,402) | (17,944)
Net increase in cash and cash equivalents | 44,377 | 72,971
CASH AND CASH EQUIVALENTS |  |
Beginning of period | 119,838 | 139,770
End of period | 164,215 | 212,741
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |
Cash paid during the period for income taxes, net of refunds | 31,076 | 36,246
Noncash investing and financing activities: |  |
Purchased property and equipment in accounts payable | 19,051 | 1,116
Common Stock Dividends Declared in Accounts Payable | $ 1,700 | $ 1,715

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