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长期债务 (Narrative) (Details) (USD $)
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12个月结束 | 0月结束 | 12个月结束 | |||||||||
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12月. 31, 2011
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10月. 31, 2011
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2011年5月3日
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3月. 31, 2011
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2月. 28, 2011
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12月. 31, 2010
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9月. 30, 2010
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9月. 30, 2010
Bank Of Nova Scotia [Member]
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12月. 24, 2010
Bank Of Nova Scotia [Member]
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12月. 31, 2011
欧元美元汇率[成员]
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12月. 31, 2011
基准利率贷款〔委员〕
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3月. 31, 2011
楼宇贷款〔委员〕
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| Debt Instrument [Line Items] | ||||||||||||
| 循环信贷安排 | $ 350,000,000 | $ 100,000,000 | ||||||||||
| 借款能力 | 125,000,000 | 90,000,000 | 50,000,000 | 65,000,000 | ||||||||
| Company's borrowings, outstanding principal amount | 49,500,000 | |||||||||||
| 贷款，定期付款 | 22,000 | |||||||||||
| Amount of current 信贷 facility used to repay former 信贷 facility | 42,000,000 | |||||||||||
| Amount of current 信贷 facility used to repay term loan | 2,500,000 | |||||||||||
| 建筑贷款，金额 | 2,400,000 | |||||||||||
| 利率说明 | 欧洲美元贷款的利率等于(1)适用利率，其范围从2.00% to 3.50%, 再加上(2)显示在路透Screen LIBOR01页面上的伦敦银行同业拆放利率.S. 美元, or, if such rate is not available, 显示英国银行家协会在美国存款的平均利率的其他页面或服务上提供的利率.S. 美元, or, if such rate is not available, 代理应查询的纽约三大货币中心银行的平均报价，作为美国存款的“伦敦银行同业拆放利率”.S. 美元. | 基准利率贷款的利率等于(1)适用利率，其范围从1.00% to 2.50%, plus (2) the highest of: (a) the federal funds rate plus 0.5%, (b)由代理人不时公开宣布为其“优惠利率”的当日有效利率," and (c) the eurodollar rate for an interest period of one month plus 1.00%. | ||||||||||
| Unamortized loan fees recognized into earnings | $ 225,000 | |||||||||||
| Building loan, interest rate | 5.82% | 6.50% | ||||||||||
| 金融契约 | (1) the ratio of funded debt to EBITDAX (net income, 不包括与ASC 815产生的掉期合同相关的任何非现金收入或费用, 在确定净收入时，从收入中扣除且不重复的部分, (a)该期间的合并利息费用总额, (b) the aggregate amount of income, 特许经营, capital or similar tax expense (other than ad valorem taxes) for such period, (c) all amounts attributable to depletion, 折旧, amortization and asset or goodwill impairment or writedown for such period, (d) all other non-cash charges, (e) non-cash losses from minority investments, (f) actual cash distributions received from minority investments, (g) to the extent actually reimbursed by insurance, expenses with respect to liability on casualty events or business interruption, (h)与资产处置和收购有关的所有合理交易费用, investments and debt and equity offering, 12个月期间的非现金收入（归属于少数股权投资的股权收入）不得大于2.00 to 1.00; and (2) the ratio of EBITDAX to interest expense for a twelve-month period may not be less than 3.00 to 1.00. | |||||||||||