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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 415,302us-gaap_CashAndCashEquivalentsAtCarryingValue $ 476,492us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable:    
Trade, net of allowance for uncollectible accounts of $5,160 and $4,735, respectively 108,377us-gaap_AccountsReceivableNetCurrent 104,724us-gaap_AccountsReceivableNetCurrent
Unbilled revenue 39,324us-gaap_UnbilledContractsReceivable 28,542us-gaap_UnbilledContractsReceivable
Costs in excess of billing 776us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 2,034us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Current deferred tax assets 23,477us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 31,180us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 33,016us-gaap_OtherAssetsCurrent 51,301us-gaap_OtherAssetsCurrent
Total current assets 620,272us-gaap_AssetsCurrent 694,273us-gaap_AssetsCurrent
Property and equipment 2,287,411us-gaap_PropertyPlantAndEquipmentGross 2,241,444us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (527,033)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (506,060)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 1,760,378us-gaap_PropertyPlantAndEquipmentNet 1,735,384us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Equity investments 148,147us-gaap_EquityMethodInvestments 149,623us-gaap_EquityMethodInvestments
Goodwill 61,336us-gaap_Goodwill 62,146us-gaap_Goodwill
Other assets, net 58,191us-gaap_OtherAssetsNoncurrent 59,272us-gaap_OtherAssetsNoncurrent
Total assets 2,648,324us-gaap_Assets 2,700,698us-gaap_Assets
Current liabilities:    
Accounts payable 80,106us-gaap_AccountsPayableCurrent 83,403us-gaap_AccountsPayableCurrent
Accrued liabilities 70,774us-gaap_AccruedLiabilitiesCurrent 104,923us-gaap_AccruedLiabilitiesCurrent
Income tax payable 3,333us-gaap_AccruedIncomeTaxesCurrent 9,143us-gaap_AccruedIncomeTaxesCurrent
Current maturities of long-term debt 32,033us-gaap_LongTermDebtCurrent 28,144us-gaap_LongTermDebtCurrent
Total current liabilities 186,246us-gaap_LiabilitiesCurrent 225,613us-gaap_LiabilitiesCurrent
Long-term debt 514,265us-gaap_LongTermDebtNoncurrent 523,228us-gaap_LongTermDebtNoncurrent
Deferred tax liabilities 247,050us-gaap_DeferredTaxLiabilitiesNoncurrent 260,275us-gaap_DeferredTaxLiabilitiesNoncurrent
Other non-current liabilities 45,753us-gaap_OtherLiabilitiesNoncurrent 38,108us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 993,314us-gaap_Liabilities 1,047,224us-gaap_Liabilities
Commitments and contingencies      
Shareholders’ equity:    
Common stock, no par, 240,000 shares authorized, 105,904 and 105,586 shares issued, respectively 936,735us-gaap_CommonStockValue 934,447us-gaap_CommonStockValue
Retained earnings 800,921us-gaap_RetainedEarningsAccumulatedDeficit 781,279us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (82,646)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (62,252)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders’ equity 1,655,010us-gaap_StockholdersEquity 1,653,474us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity $ 2,648,324us-gaap_LiabilitiesAndStockholdersEquity $ 2,700,698us-gaap_LiabilitiesAndStockholdersEquity