Income Taxes (Schedule Of Significant Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Receivables allowance	$ 746	$ 1,361
Inventory	146us-gaap_DeferredTaxAssetsInventory	273us-gaap_DeferredTaxAssetsInventory
Asset retirement obligation	625	573
Accrued liabilities	15,573	12,117
Operating loss carryforward	39,737	48,679
Goodwill and intangibles	9,659	1,768
Deferred compensation	12,008	10,693
Total deferred tax assets	78,494us-gaap_DeferredTaxAssetsNet	75,464us-gaap_DeferredTaxAssetsNet
Property and equipment	(209,650)	(206,562)
Prepaid expenses	(1,801)	(1,772)
Total deferred tax liabilities	(211,451)us-gaap_DeferredTaxLiabilities	(208,334)us-gaap_DeferredTaxLiabilities
Net deferred tax liability	(132,957)us-gaap_DeferredTaxAssetsLiabilitiesNet	(132,870)us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax assets - current	14,664bas_TotalDeferredTaxAssetsNetCurrent	31,436bas_TotalDeferredTaxAssetsNetCurrent
Deferred tax liabilities - non-current	(147,621)	(164,306)
Net deferred tax liabilities	$ (132,957)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (132,870)us-gaap_DeferredTaxAssetsLiabilitiesNet

Total Deferred Tax Assets, Net Current

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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