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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for Accounts Receivable Losses, USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Allowance for Accounts Receivable Losses
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| Allowance for Accounts Receivable Losses | |||
| Balance at Beginning of Period | $ 2,503 | $ 2,116 | $ 2,329 |
| Additions Charged to Operations | 95 | 388 | 549 |
| Acquired | 658 | 224 | |
| Write-offs (net) | (1,080) | (225) | (762) |
| Balance at End of Period | $ 2,176 | $ 2,503 | $ 2,116 |