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
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Supplemental Cash Flow Elements [Abstract]    
Non-cash additions for purchases of property and equipment $ 25,114 $ 13,740
Net capital lease obligation 9,386 0
Distribution to non-controlling interest 4,167 0
Asset retirement obligation additions to property and equipment 361 1,066
Deferred compensation distribution denominated in shares $ 617 $ 621