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Acquisitions and Other Investments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |
Business combination, provisional information, initial accounting incomplete, items |  |  | As of June 30, 2013, the allocations of purchase prices to the fair values of tangible and intangible assets and liabilities, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for these acquisitions, are provisional and remain preliminary as 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 of the acquired businesses, as prescribed in the corresponding purchase agreements. |  |
Asset impairment charges, cost method investments | $ 0 | $ 0 | $ 0 | $ 0 |
Asset impairment charges, equity method investments | 0 | 0 | 0 | 0 |
Segment, Discontinued Operations [Member] | Panama Subsidiary [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Less than wholly owned subsidiary, ownership percentage | 60.00% |  | 60.00% |  |
Segment, Discontinued Operations [Member] | Panama Subsidiary [Member] | Rock Extraction Business [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 34.00% |  | 34.00% |  |
Related party revenues | 0 | 400,000 | 0 | 1,200,000 |
Related party receivables, equity method investee | $ 3,700,000 |  | $ 3,700,000 |  | $ 3,700,000
Segment, Discontinued Operations [Member] | Beneficial Owner [Member] | Rock Extraction Business [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 20.40% |  | 20.40% |  |
Ec Source Services Llc [Member] | Earn-out Arrangements [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Change in range of outcomes, contingent consideration, reasons |  |  | the Company remeasured the contingent consideration liability for EC Source Services LLC ("EC Source") using currently available facts and circumstances, including recent and expected future performance |  |
Optima Network Services Inc [Member] | Earn-out Arrangements [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Change in range of outcomes, contingent consideration, reasons |  |  | the contingent consideration liability for Optima Network Services, Inc. ("Optima") was remeasured and settled in full during the first quarter of 2013 as a result of an amendment to the Optima purchase agreement effective February 28, 2013 |  |

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- Definition This element represents a description of the reasons causing an amount of any change recognized during the period in the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph b -Clause 2 -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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