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Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets and Liabilities (Estimated Useful Lives of Intangible Assets Subject to Periodic Amortization on a Straight-Line Basis) (Details)

 v2.3.0.11
Goodwill and Other Intangible Assets and Liabilities (Estimated Useful Lives of Intangible Assets Subject to Periodic Amortization on a Straight-Line Basis) (Details)
6 Months Ended
Jun. 30, 2011
years
Use Rights [Member]
Ìý
Useful Life, Minimum (years) 15
Useful Life, Maximum (years) 28
Utility Contracts [Member]
Ìý
Useful Life (years) 5
Easements [Member]
Ìý
Useful Life (years) 30
Lease Agreements [Member]
Ìý
Useful Life, Minimum (years) 1.5
Useful Life, Maximum (years) 4.5
Unpatented Technology [Member]
Ìý
Useful Life (years) 5