Quarterly report pursuant to Section 13 or 15(d)

财产及设备 (Schedule Of Asset Retirement Obligation) (Details)

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财产及设备 (Schedule Of Asset Retirement Obligation) (Details) (USD $)
In Thousands, unless otherwise specified
3个月结束
3月. 31, 2014
3月. 31, 2013
12月. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligation, beginning of period $ 15,083 $ 13,275  
负债已经发生 1,869 670  
负债结算 (1,695) (780)  
增长的费用 188 175  
Asset retirement obligation as of end of period 15,445 13,340  
小电流部分 795 780 795
Asset retirement obligation, long-term $ 14,650 $ 12,560 $ 14,288