Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Cash Flows Supplemental Disclosures ( Non-cash investing and financing activities) (Details)

v2.4.0.6
Consolidated Statement of Cash Flows Supplemental Disclosures ( Non-cash investing and financing activities) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Cash Flows Supplemental Disclosures [Abstract]    
Non-cash additions for purchases of property and equipment $ 7,390 $ 11,481
Deferred compensation distribution denominated in shares 511 0
Asset retirement obligation additions to property and equipment 644 222
Asset retirement obligation reductions to property and equipment for revisions to previous estimates $ 0 $ 294