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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II PURSUANT TO ITEM 15(a)(2) OF FORM 10-K VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED December 31, 2011, 2010 AND 2009
|  |  |  | ADDITIONS |  |  |  |
DESCRIPTION |  | BALANCE AT BEGINNING OF PERIOD |  | CHARGED TO COSTS AND EXPENSES |  | CHARGED (CREDITED) TO OTHER ACCOUNTS(A) |  | DEDUCTIONS(B) |  | BALANCE AT END OF PERIOD
Allowance for doubtful accounts deducted from accounts receivable in the balance sheet |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2011 |  | $ | 4,440,000 |  |  | $ | 340,000 |  |  | $ | 230,000 |  |  | $ | 1,230,000 |  |  | $ | 3,780,000 |
Year ended December 31, 2010 |  | $ | 5,560,000 |  |  | $ | 730,000 |  |  | $ | (230,000 | ) |  | $ | 1,620,000 |  |  | $ | 4,440,000 |
Year ended December 31, 2009 |  | $ | 5,620,000 |  |  | $ | 1,750,000 |  |  | $ | — |  |  | $ | 1,810,000 |  |  | $ | 5,560,000 |
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(A) | Allowance of companies acquired, and other adjustments, net.
(B) | Deductions, representing uncollectible accounts written-off, less recoveries of amounts written-off in prior years.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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