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Detail of Certain Balance Sheet Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Activity in allowance for doubtful accounts |  |  |
Balance at beginning of year | $ 4,615 | $ 5,029 | $ 7,200
Additions for bad debt expense | 2,753 | 214 | 340
Deductions for uncollectible receivables written off, net of recoveries | (1,090) | (770) | (2,689)
Allowance for doubtful accounts of acquired companies at date of acquisition | 55 | 142 | 178
Balance at end of year | 6,333 | 4,615 | 5,029
Other current liabilities |  |  |
Accrued warranty costs | 6,781 | 8,234 |
Accrued job losses | 2,137 | 1,777 |
Accrued rent and lease obligations | 673 | 2,793 |
Accrued sales and use tax | 1,710 | 1,494 |
Deferred revenue | 1,143 | 1,592 |
Liabilities due to former owners | 2,349 |  |
Other current liabilities | 12,284 | 13,959 |
Total other current liabilities | 27,077 | 29,849 |
Contracts in progress |  |  |
Costs incurred on contracts in progress | 1,182,085 | 1,071,406 |
Estimated earnings, net of losses | 134,534 | 132,096 |
Less-Billings to date | (1,364,229) | (1,247,535) |
Contracts in progress | (47,610) | (44,033) |
Costs and estimated earnings in excess of billings | 26,204 | 26,602 |
Billings in excess of costs and estimated earnings | $ (73,814) | $ (70,635) |

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