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Other Noncurrent Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Other Noncurrent Assets    
Deferred financing costs $ 41,055 $ 44,706
Field inventory 9,676 9,682
Other 211 209
Other noncurrent assets $ 50,942 $ 54,597