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Consolidated Statements of Cash Flows (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
OPERATING ACTIVITIES  
Net income$ 52,810$ 46,837
Adjustments to reconcile net income to net cash provided by operating activities:  
Depreciation41,42646,241
Deferred income taxes13,543(7,068)
Gain on disposal of property and equipment(22,329)(10,484)
Changes in certain working capital items:  
Trade receivables(2,800)(7,777)
Prepaid expenses and other current assets(8,132)(482)
Accounts payable, accrued liabilities, and accrued expenses5836,771
Accrued income taxes(3,207)(1,128)
Net cash provided by operating activities71,89472,910
INVESTING ACTIVITIES  
Proceeds from sale of property and equipment49,38515,639
Purchases of property and equipment, net of trades(91,274)445
Maturity and calls of investments24,22550,325
Purchases of investments0(17,408)
Change in other assets(1,726)(655)
Net cash (used in) provided by investing activities(19,390)48,346
FINANCING ACTIVITIES  
Cash dividends(3,627)(3,628)
Repurchases of common stock(28,875)0
Net cash used in financing activities(32,502)(3,628)
Net increase in cash and cash equivalents20,002117,628
CASH AND CASH EQUIVALENTS  
Beginning of period121,12052,351
End of period141,122169,979
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION  
Cash paid during the period for income taxes, net of refunds17,16529,450
Noncash investing and financing activities:  
Purchased property and equipment in accounts payable5,8874,042
Common stock dividends declared in accounts payable1,79092,502
Treasury stock acquired in accounts payable$ 768$ 0