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

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- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.32) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 + Details
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.21) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
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- Definition Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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