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Property, Plant and Equipment, net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, plant and equipment, net    
Property, plant and equipment, gross $ 5,567,800 $ 4,971,250
Accumulated depreciation (2,272,867) (2,150,978)
Property, plant and equipment, net 3,294,933 2,820,272
Compression equipment, facilities and other fleet assets
    
Property, plant and equipment, net    
Property, plant and equipment, gross 4,868,593 4,304,019
Land and buildings
    
Property, plant and equipment, net    
Property, plant and equipment, gross 204,900 197,778
Transportation and shop equipment
    
Property, plant and equipment, net    
Property, plant and equipment, gross 301,645 288,042
Other
    
Property, plant and equipment, net    
Property, plant and equipment, gross $ 192,662 $ 181,411