根据第13或15(d)条提交的季度报告

财产及设备(资产退休义务表)(详情)

v2.4.0.6
财产和设备(资产退休义务表)(详细信息)(美元)
除非另有说明,单位为千
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
资产退休义务,前滚分析[前滚]      
资产退休义务,期初 $ 13,275 $ 12,653  
Liabilities incurred 670 598  
Liabilities settled (780) (531)  
Accretion expense 175 176  
期末资产退休义务 13,340 12,896  
Less current portion 780 620 60
资产退休义务,长期 $ 12,560 $ 12,276 $ 13,215