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Significant Concentrations (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2011 SVA - NEC [Member] | Dec. 31, 2010 SVA - NEC [Member] | Dec. 31, 2012 SVA - NEC [Member] | Dec. 31, 2008 SVA - NEC [Member] | Dec. 31, 2012 Sales Revenue, Services, Net [Member] Customer A And Its Affiliates [Member] | Dec. 31, 2011 Sales Revenue, Services, Net [Member] Customer A And Its Affiliates [Member] | Dec. 31, 2010 Sales Revenue, Services, Net [Member] Customer A And Its Affiliates [Member] | Dec. 31, 2012 Sales Revenue, Services, Net [Member] Customer Concentration Risk [Member] | Dec. 31, 2011 Sales Revenue, Services, Net [Member] Customer Concentration Risk [Member] | Dec. 31, 2010 Sales Revenue, Services, Net [Member] Customer Concentration Risk [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer A And Its Affiliates [Member] | Dec. 31, 2011 Accounts Receivable [Member] Customer A And Its Affiliates [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer Concentration Risk [Member] | Dec. 31, 2011 Accounts Receivable [Member] Customer Concentration Risk [Member]
Concentration Risk, Percentage |  |  |  |  | 11.70% | 5.70% | 0.20% | 34.20% | 40.80% | 52.20% | 14.00% | 10.30% | 35.10% | 44.10%
Accounts Receivable Gross | $ 15.2 |  | $ 15.2 |  |  |  |  |  |  |  |  |  |  |
Allowance For Doubtful Accounts Receivable | 15.2 |  | 15.2 | 25.3 |  |  |  |  |  |  |  |  |  |
Recovery Of Bad Debts Allowance | $ 1.5 | $ 8.6 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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