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COMMITMENTS AND CONTINGENCIES: (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Operating Lease Payments, Years ending December 31:  
2015 $ 9,840us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 9,290us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 8,767us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 5,511us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 4,467us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
2020 and thereafter 16,824us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total 54,699us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Other Operating Contracts and Agreements,Years ending December 31:  
2015 63,209us-gaap_ContractualObligationDueInNextTwelveMonths
2016 23,810us-gaap_ContractualObligationDueInSecondYear
2017 14,723us-gaap_ContractualObligationDueInThirdYear
2018 1,452us-gaap_ContractualObligationDueInFourthYear
2019 41us-gaap_ContractualObligationDueInFifthYear
2020 and thereafter 81us-gaap_ContractualObligationDueAfterFifthYear
Total $ 103,316us-gaap_ContractualObligation