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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Property, plant and equipment, accumulated depreciation (in dollars) | $ 2,173,583 | $ 2,125,286
Preferred stock, authorized shares | 10,000,000 | 10,000,000
Preferred stock, issued shares | 0 | 0
Common stock, authorized shares | 200,000,000 | 200,000,000
Common stock, issued shares | 99,541,518 | 97,928,403
Common stock, outstanding shares | 99,541,518 | 97,928,403

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