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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Self-insurance $ 12,510us-gaap_AccruedInsuranceCurrent $ 12,610us-gaap_AccruedInsuranceCurrent
Wages and bonus 22,340us-gaap_EmployeeRelatedLiabilitiesCurrent 23,670us-gaap_EmployeeRelatedLiabilitiesCurrent
Other 66,200us-gaap_OtherAccruedLiabilitiesCurrent 48,850us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities $ 101,050us-gaap_AccruedLiabilitiesCurrent $ 85,130us-gaap_AccruedLiabilitiesCurrent