XML 49 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
Asset Retirement Obligation (Tables)
12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation [Abstract]  
Schedule of asset retirement obligation
                 

In thousands

    2012       2011  

Balance at Jan. 1,

  $ 9,679     $ 9,717  

Upward revision

          611  

Accretion

    458       550  

Payments

    (1,255     (1,199

Balance at Dec. 31,

  $ 8,882     $ 9,679