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Accounts Receivable | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | ## 4. Accounts Receivable ## Accounts receivable consisted of the following at December 31:
(in thousands) |  | 2017 |  | 2016
Contract receivables |  | $ | 231,808 |  |  | $ | 200,732 |
Contract retainages |  |  | 42,732 |  |  |  | 32,486 |
Other |  |  | 9,073 |  |  |  | 1,856 |
|  |  | 283,613 |  |  |  | 235,074 |
Less: Allowance for doubtful accounts |  |  | (605 | ) |  |  | (432 | )
|  | $ | 283,008 |  |  | $ | 234,642 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
(in thousands) |  | 2017 |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 432 |  |  | $ | 376 |  |  | $ | 1,179 |
Less: Reduction in (provision for) allowances |  |  | (263 | ) |  |  | (146 | ) |  |  | 528 |
Less: Write offs, net of recoveries |  |  | 92 |  |  |  | 90 |  |  |  | 275 |
Change in foreign currency translation |  |  | (2 | ) |  |  | — |  |  |  | — |
Balance at end of period |  | $ | 605 |  |  | $ | 432 |  |  | $ | 376

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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