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Property, Plant and Equipment, net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, plant and equipment, net    
Property, plant and equipment, gross $ 4,944,248 $ 4,817,383
Accumulated depreciation (2,111,286) (1,975,352)
Property, plant and equipment, net 2,832,962 2,842,031
Compression equipment, facilities and other fleet assets
   
Property, plant and equipment, net    
Property, plant and equipment, gross 4,289,831 4,207,772
Land and buildings
   
Property, plant and equipment, net    
Property, plant and equipment, gross 194,595 186,410
Transportation and shop equipment
   
Property, plant and equipment, net    
Property, plant and equipment, gross 281,901 261,520
Other
   
Property, plant and equipment, net    
Property, plant and equipment, gross $ 177,921 $ 161,681