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Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Accounts Receivable |  |
Contract receivables | $ 113,572 | $ 112,316
Contract retainages | 60,694 | 56,053
Other | 334 | 177
Accounts receivable, gross current | 174,600 | 168,546
Less: Allowance for doubtful accounts | (1,132) | (1,305)
Accounts receivable, net current | 173,468 | 167,241
Roll-forward activity of allowance for doubtful accounts |  |
Balance at beginning of period | (1,305) | (1,078)
Reduction in (provision for) allowances | 159 | (383)
Write offs, net of recoveries | 14 | 156
Balance at end of period | $ (1,132) | $ (1,305)

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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