Quarterly report pursuant to Section 13 or 15(d)

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

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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, 2013
Sep. 30, 2012
Supplemental Cash Flow Elements [Abstract]    
Non-cash additions for purchases of property and equipment $ 17,013 $ 20,854
Asset retirement obligation additions to property and equipment 1,066 644
Deferred compensation distribution denominated in shares 621 511
Net assets acquired with equity in AWN (see Note 1(d)) $ 272,198 $ 0