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Intangible Assets from Acquisitions (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Intangible assets from acquisitions (Textual) [Abstract] |  |  |  |  |
Original cost and accumulated amortization of fully amortized intangible assets | $ 82,200,000 |  | $ 82,200,000 |  | $ 42,600,000
Amortization expense for intangible assets | 1,100,000 | 1,700,000 | 3,700,000 | 3,800,000 |
Estimated amortization expense, remainder of 2012 | 1,100,000 |  | 1,100,000 |  |
Estimated amortization expense, 2013 | 2,900,000 |  | 2,900,000 |  |
Estimated amortization expense, 2014 | 433,000 |  | 433,000 |  |
Estimated amortization expense, thereafter | $ 0 |  | $ 0 |  |
Period estimated for amortization expense |  |  | Next five years |  |

X
- Definition Amount of amortization expense expected to be recognized after the third rolling twelve months following the latest balance sheet presented for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Original cost and accumulated amortization of fully amortized intangible assets. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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