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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenues $ 406,270us-gaap_SalesRevenueNet $ 501,692us-gaap_SalesRevenueNet
Cost of revenues (exclusive of items shown below) 292,445us-gaap_CostOfGoodsAndServicesSold 330,015us-gaap_CostOfGoodsAndServicesSold
Selling, general and administrative expenses 42,637us-gaap_SellingGeneralAndAdministrativeExpense 48,708us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization 65,976us-gaap_DepreciationAndAmortization 55,505us-gaap_DepreciationAndAmortization
(Gain) loss on disposition of assets, net (958)us-gaap_GainLossOnDispositionOfAssets 2,232us-gaap_GainLossOnDispositionOfAssets
Operating profit 6,170us-gaap_OperatingIncomeLoss 65,232us-gaap_OperatingIncomeLoss
Interest expense (691)us-gaap_InterestExpense (337)us-gaap_InterestExpense
Interest income 6us-gaap_InvestmentIncomeInterest 4us-gaap_InvestmentIncomeInterest
Other income, net 5,789us-gaap_OtherNonoperatingIncomeExpense 80us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 11,274us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 64,979us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision 3,726us-gaap_IncomeTaxExpenseBenefit 25,591us-gaap_IncomeTaxExpenseBenefit
Net income $ 7,548us-gaap_NetIncomeLoss $ 39,388us-gaap_NetIncomeLoss
Earnings per share    
Basic (in dollars per share) $ 0.04us-gaap_EarningsPerShareBasic $ 0.18us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.04us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) $ 0.105us-gaap_CommonStockDividendsPerShareCashPaid $ 0.105us-gaap_CommonStockDividendsPerShareCashPaid
Weighted average shares outstanding    
Basic (in shares) 213,492us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 215,175us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 213,585us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 216,214us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding