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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 43,012us-gaap_CashAndCashEquivalentsAtCarryingValue $ 249,509us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $3,546 and $3,674 at December 31, 2014 and 2013, respectively 663,404us-gaap_AccountsReceivableNetCurrent 451,517us-gaap_AccountsReceivableNetCurrent
Federal and state income taxes receivable 81,726us-gaap_IncomeTaxesReceivable  
Inventory 32,251us-gaap_InventoryNet 21,248us-gaap_InventoryNet
Deferred tax assets, net 37,075us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 32,952us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other 51,624us-gaap_OtherAssetsCurrent 53,424us-gaap_OtherAssetsCurrent
Total current assets 909,092us-gaap_AssetsCurrent 808,650us-gaap_AssetsCurrent
Property and equipment, net 4,131,071us-gaap_PropertyPlantAndEquipmentNet 3,635,541us-gaap_PropertyPlantAndEquipmentNet
Goodwill and intangible assets 220,813us-gaap_IntangibleAssetsNetIncludingGoodwill 167,470us-gaap_IntangibleAssetsNetIncludingGoodwill
Deposits on equipment purchases 112,379us-gaap_DepositsAssetsNoncurrent 52,560us-gaap_DepositsAssetsNoncurrent
Other 20,656us-gaap_OtherAssetsNoncurrent 22,906us-gaap_OtherAssetsNoncurrent
Total assets 5,394,011us-gaap_Assets 4,687,127us-gaap_Assets
Current liabilities:    
Accounts payable 382,438us-gaap_AccountsPayableCurrent 173,150us-gaap_AccountsPayableCurrent
Federal and state income taxes payable   10,670us-gaap_AccruedIncomeTaxesCurrent
Accrued expenses 173,466us-gaap_AccruedLiabilitiesCurrent 160,457us-gaap_AccruedLiabilitiesCurrent
Current portion of long-term debt 12,500us-gaap_LongTermDebtCurrent 10,000us-gaap_LongTermDebtCurrent
Total current liabilities 568,404us-gaap_LiabilitiesCurrent 354,277us-gaap_LiabilitiesCurrent
Borrowings under revolving credit facility 303,000us-gaap_LongTermLineOfCredit  
Other long-term debt 670,000us-gaap_OtherLongTermDebtNoncurrent 682,500us-gaap_OtherLongTermDebtNoncurrent
Deferred tax liabilities, net 935,660us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 887,864us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other 11,137us-gaap_OtherLiabilitiesNoncurrent 6,489us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 2,488,201us-gaap_Liabilities 1,931,130us-gaap_Liabilities
Commitments and contingencies (see Note 8)      
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 189,262,876 and 186,487,246 issued and 146,444,291 and 144,219,189 outstanding at December 31, 2014 and 2013, respectively 1,893us-gaap_CommonStockValue 1,865us-gaap_CommonStockValue
Additional paid-in capital 984,674us-gaap_AdditionalPaidInCapital 913,505us-gaap_AdditionalPaidInCapital
Retained earnings 2,811,815us-gaap_RetainedEarningsAccumulatedDeficit 2,707,439us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 6,463us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 14,076us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 42,818,585 shares and 42,268,057 shares at December 31, 2014 and 2013, respectively (899,035)us-gaap_TreasuryStockValue (880,888)us-gaap_TreasuryStockValue
Total stockholders’ equity 2,905,810us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2,755,997us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders’ equity $ 5,394,011us-gaap_LiabilitiesAndStockholdersEquity $ 4,687,127us-gaap_LiabilitiesAndStockholdersEquity