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Acquisition and Investments (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 29, 2012 Acquisition of Tenco Group Inc | Oct. 20, 2011 Acquisition of Tenco Group Inc | Sep. 30, 2012 Acquisition of Tenco Group Inc | Dec. 31, 2011 Acquisition of Tenco Group Inc | Oct. 17, 2011 Acquisition of Tenco Group Inc | Sep. 30, 2012 Acquisition of Tenco Group Inc | Dec. 31, 2012 Acquisition of Tenco Group Inc | Oct. 18, 2011 Acquisition of Tenco Group Inc
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Purchase Price |  |  |  |  |  | $ 5,933,000 |  |  | $ 5,933,000 |  | $ 5,933,000
Fair value of net assets acquired |  |  |  |  |  | 14,549,000 |  |  | 14,549,000 |  | 13,678,000
Gain on Bargain purchase | 0 | 8,616,000 | 0 | 8,616,000 | 7,745,000 |  | 8,600,000 | 7,745,000 |  |  |
Purchase accounting adjustments |  |  |  | 871,000 |  |  |  |  | 871,000 |  |
Acquisition related costs |  |  |  |  |  |  | 600,000 |  |  |  |
Revenue generated by Tenco | 628,402,000 | 603,593,000 | 538,548,000 |  |  | 7,000,000 |  |  |  | 28,400,000 |
Net income of Tenco |  |  |  |  |  | $ 200,000 |  |  |  | $ 800,000 |

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 24 -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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