Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 27,366	$ 31,030
Accumulated depreciation and depletion on Property, plant and equipment	2,159,166	1,827,011
Accumulated amortization of Intangible and other long-term assets	$ 110,115	$ 84,567
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	153,958,963	158,976,784
Common stock, shares outstanding	154,019,882	159,158,022