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Income Taxes Deferred Tax Summary (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Income Taxes [Abstract] |  |
Net deferred tax assets | $ 13,797 | $ 14,401
Deferred Tax Liabilities, Noncurrent | (51,306) | (57,661)
Deferred Tax Assets (Liabilities), Net | $ (37,509) | $ (43,260)

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