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Acquisitions and Divestitures - Dynamic Acquisition - Unaudited Pro Forma Results of Operations (Parenthetical) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Apr. 17, 2012 Dynamic Acquisition | Jun. 30, 2012 Dynamic Acquisition | Jun. 30, 2012 Dynamic Acquisition | Jun. 30, 2012 Pro Forma Adjustment Dynamic Acquisition | Jun. 30, 2012 Pro Forma Adjustment Dynamic Acquisition
Business Acquisition |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  | $ 9,900,000 | $ 12,400,000 | $ (9,900,000) | $ (12,400,000)
Bargain purchase gain | 0 | (122,696,000) | 0 | (122,696,000) | (122,696,000) | [1] |  |  | 122,696,000 | 122,696,000
Reversal of deferred tax asset valuation allowance |  |  |  |  |  |  |  |  | (100,288,000) | (100,288,000)
Fees to secure financing for acquisition |  |  |  |  |  |  |  | $ 10,900,000 |  | $ (10,900,000)
[1] | The bargain purchase gain results from the excess of the fair value of net assets acquired over consideration paid. To validate the bargain purchase gain on this acquisition, the Company reviewed its initial identification and valuation of assets acquired and liabilities assumed. The Company believes it was able to acquire Dynamic for less than the estimated fair value of its net assets due to their offshore location resulting in less bidding competition.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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