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CONSOLIDATED CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 86,917us-gaap_CashAndCashEquivalentsAtCarryingValue $ 43,012us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $3,537 and $3,546 at March 31, 2015 and December 31, 2014, respectively 484,986us-gaap_AccountsReceivableNetCurrent 663,404us-gaap_AccountsReceivableNetCurrent
Federal and state income taxes receivable   81,726us-gaap_IncomeTaxesReceivable
Inventory 28,346us-gaap_InventoryNet 32,251us-gaap_InventoryNet
Deferred tax assets, net 39,926us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 37,075us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other 47,445us-gaap_OtherAssetsCurrent 51,624us-gaap_OtherAssetsCurrent
Total current assets 687,620us-gaap_AssetsCurrent 909,092us-gaap_AssetsCurrent
Property and equipment, net 4,222,404us-gaap_PropertyPlantAndEquipmentNet 4,131,071us-gaap_PropertyPlantAndEquipmentNet
Goodwill and intangible assets 219,902us-gaap_IntangibleAssetsNetIncludingGoodwill 220,813us-gaap_IntangibleAssetsNetIncludingGoodwill
Deposits on equipment purchases 80,159us-gaap_DepositsAssetsNoncurrent 112,379us-gaap_DepositsAssetsNoncurrent
Other 20,822us-gaap_OtherAssetsNoncurrent 20,656us-gaap_OtherAssetsNoncurrent
Total assets 5,230,907us-gaap_Assets 5,394,011us-gaap_Assets
Current liabilities:    
Accounts payable 315,746us-gaap_AccountsPayableCurrent 382,438us-gaap_AccountsPayableCurrent
Federal and state income taxes payable 30,994us-gaap_AccruedIncomeTaxesCurrent  
Accrued expenses 178,876us-gaap_AccruedLiabilitiesCurrent 173,466us-gaap_AccruedLiabilitiesCurrent
Current portion of long-term debt 35,000us-gaap_LongTermDebtCurrent 12,500us-gaap_LongTermDebtCurrent
Total current liabilities 560,616us-gaap_LiabilitiesCurrent 568,404us-gaap_LiabilitiesCurrent
Borrowings under revolving credit facility   303,000us-gaap_LongTermLineOfCredit
Other long-term debt 845,000us-gaap_OtherLongTermDebtNoncurrent 670,000us-gaap_OtherLongTermDebtNoncurrent
Deferred tax liabilities, net 914,711us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 935,660us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other 12,042us-gaap_OtherLiabilitiesNoncurrent 11,137us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 2,332,369us-gaap_Liabilities 2,488,201us-gaap_Liabilities
Commitments and contingencies (see Note 9)      
Stockholders' equity:    
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued      
Common stock, par value $.01; authorized 300,000,000 shares with 189,265,286 and 189,262,876 issued and 146,446,701 and 146,444,291 outstanding at March 31, 2015 and December 31, 2014 1,893us-gaap_CommonStockValue 1,893us-gaap_CommonStockValue
Additional paid-in capital 991,495us-gaap_AdditionalPaidInCapitalCommonStock 984,674us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 2,806,300us-gaap_RetainedEarningsAccumulatedDeficit 2,811,815us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (2,115)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 6,463us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 42,818,585 shares at March 31, 2015 and December 31, 2014 (899,035)us-gaap_TreasuryStockValue (899,035)us-gaap_TreasuryStockValue
Total stockholders' equity 2,898,538us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2,905,810us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders' equity $ 5,230,907us-gaap_LiabilitiesAndStockholdersEquity $ 5,394,011us-gaap_LiabilitiesAndStockholdersEquity