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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Allowance for doubtful accounts receivable and revenue adjustments |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 5,957 | $ 3,944 | $ 3,470
Additions, Charged to Costs and Expenses | 1,524 | 2,394 | 868
Additions, Charged to Other Accounts | 26 | 2,667 | 1,640
Deductions | 2,258 | 3,048 | 2,034
Balance at End of Period | 5,249 | 5,957 | 3,944
Allowance for other accounts receivable |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 1,226 | 1,254 | 1,149
Additions, Charged to Costs and Expenses | 108 | (28) | 105
Balance at End of Period | 1,334 | 1,226 | 1,254
Allowance for deferred tax assets |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 5,644 | 2,455 | 3,013
Additions, Charged to Costs and Expenses | 791 | 214 | 1,217
Additions, Charged to Other Accounts | 47 | 3,971 |
Deductions | 3,971 | 996 | 1,775
Balance at End of Period | $ 2,511 | $ 5,644 | $ 2,455

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + 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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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + 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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + 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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