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Acquisitions and Divestitures - Dynamic Acquisition - Unaudited Pro Forma Results of Operations (Parenthetical) (Details) (Dynamic Acquisition, USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Dynamic Acquisition |  |
Business Acquisition [Line Items] |  |
Business combination, bargain purchase gain, pro forma adjustment | $ (122,696,000) | $ 122,696,000
Fees to secure financing for acquisition, pro forma adjustment | (10,900,000) | 10,900,000
Reversal of deferred tax asset valuation allowance, pro forma adjustment | (100,300,000) | 100,300,000
Business combination, acquisition related costs, pro forma adjustment | $ (13,000,000) | $ 13,000,000

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