Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 17,392	$ 17,484
Accumulated depreciation and depletion on Property, plant and equipment	984,221	970,137
Accumulated amortization of Intangible and other long-term assets	$ 26,174	$ 20,123
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	125,000,000
Common stock, shares issued	156,920,904	80,425,443
Common stock, shares outstanding	157,516,128	80,425,443