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Supplementary Information Supplementary Information (Balance Sheet Disclosures) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Current Assets:    
Deferred taxes $ 3,750us-gaap_DeferredTaxAssetsNetCurrent $ 2,779us-gaap_DeferredTaxAssetsNetCurrent
Income Taxes Receivable, Current 3,293us-gaap_IncomeTaxesReceivable 593us-gaap_IncomeTaxesReceivable
Other current assets 101csv_OtherCurrentAssets 153csv_OtherCurrentAssets
Total other current assets 7,144us-gaap_OtherAssetsCurrent 3,525us-gaap_OtherAssetsCurrent
Other Liabilities:    
Liabilities associated with uncertain tax positions 0us-gaap_LiabilityForUncertainTaxPositionsCurrent 7,832us-gaap_LiabilityForUncertainTaxPositionsCurrent
Other liabilities 1,437csv_OtherCurrentLiabilities 2,107csv_OtherCurrentLiabilities
Total other liabilities 1,437us-gaap_OtherLiabilitiesCurrent 9,939us-gaap_OtherLiabilitiesCurrent
Accrued Liabilities:    
Accrued salaries and wages 2,073us-gaap_AccruedSalariesCurrent 1,882us-gaap_AccruedSalariesCurrent
Accrued incentive compensation 5,660us-gaap_AccruedBonusesCurrent 4,654us-gaap_AccruedBonusesCurrent
Accrued vacation 1,978us-gaap_AccruedVacationCurrent 1,979us-gaap_AccruedVacationCurrent
Accrued insurance 2,171us-gaap_AccruedInsuranceCurrent 2,778us-gaap_AccruedInsuranceCurrent
Accrued interest 1,232us-gaap_InterestPayableCurrent 0us-gaap_InterestPayableCurrent
Accrued ad valorem and franchise taxes 537csv_AccruedAdValoremAndFranchiseTaxesCurrent 383csv_AccruedAdValoremAndFranchiseTaxesCurrent
Other accrued liabilities 1,552us-gaap_OtherAccruedLiabilitiesCurrent 1,178us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities $ 15,203us-gaap_AccruedLiabilitiesCurrent $ 12,854us-gaap_AccruedLiabilitiesCurrent