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Acquisitions (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2015
Business Combinations [Abstract] |
Business combinations, provisional information, initial accounting incomplete, items | As of September 30, 2015, determination of the fair values of the net assets acquired, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the WesTower acquisition, as discussed below, were provisional and remained preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital, as prescribed in the purchase agreement.
Business combinations, provisional information, initial accounting incomplete, reasons | During the measurement period, as defined under U.S. GAAP, the Company will revise its preliminary estimates of the fair values of net assets acquired if new information is obtained about the facts and circumstances existing as of the date of acquisition or for purchase price adjustments.

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- Definition This element represents a statement of which of the assets, liabilities, equity interests, recognized in the financial statements or items of consideration transferred for which the initial accounting is incomplete in connection with a business combination occurring during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1500-128463 + Details
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- Definition This element represents a description of the reasons why the initial accounting is incomplete for those particular assets, liabilities, noncontrolling interests, or items of consideration for which the amounts recognized in the financial statements have been determined only provisionally. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1500-128463 + Details
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