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ACCRUED LIABILITIES AND OTHER LIABILITIES (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accrued liabilities [Abstract]    
Employee compensation, related taxes and benefits $ 15,145,000us-gaap_AccruedEmployeeBenefitsCurrent $ 14,318,000us-gaap_AccruedEmployeeBenefitsCurrent
Taxes other than income and withholding 9,322,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 8,231,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Self-insurance reserves 5,942,000us-gaap_SelfInsuranceReserveCurrent 5,326,000us-gaap_SelfInsuranceReserveCurrent
Other 9,551,000us-gaap_OtherAccruedLiabilitiesCurrent 8,463,000us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities 39,960,000us-gaap_AccruedLiabilitiesCurrent 36,338,000us-gaap_AccruedLiabilitiesCurrent
Other liabilities [Abstract]    
Straight-line lease liability 10,850,000us-gaap_DeferredRentCreditNoncurrent 11,581,000us-gaap_DeferredRentCreditNoncurrent
Self-insurance reserves 2,921,000us-gaap_SelfInsuranceReserveNoncurrent 2,894,000us-gaap_SelfInsuranceReserveNoncurrent
Other 12,580,000us-gaap_OtherSundryLiabilitiesNoncurrent 10,805,000us-gaap_OtherSundryLiabilitiesNoncurrent
Other liabilities $ 26,351,000us-gaap_OtherLiabilitiesNoncurrent $ 25,280,000us-gaap_OtherLiabilitiesNoncurrent