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New Accounting Standards Implemented - Schedule of Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 02, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Trade accounts receivable, net | $ 91,852 |  |  |  | $ 110,464
Inventories | 88,452 |  |  |  | 71,656
Unbilled receivables on uncompleted contracts |  |  |  |  | 9,996
Contract assets - current portion | 45,836 |  |  | $ 45,468 |
Other Assets |  |  |  |  | 275,884
Contract assets - Non-current | 5,531 |  |  |  |
Total Assets | 490,574 |  |  |  | 468,000
Contract liabilities - current | 17,915 |  |  | 18,945 |
Current portion of customer advances on uncompleted contracts |  |  |  |  | 11,429
Other current liabilities | 8,936 |  |  |  | 13,626
Customer advances on uncompleted contracts - non-current |  |  |  |  | 1,571
Contract liabilities - non-current | 1,750 |  |  | $ 1,571 |
Other Liabilities |  |  |  |  | 319,709
Total liabilities | 343,312 |  |  |  | 346,335
Retained earnings | 20,071 |  |  |  | 22,212
Total shareholders' equity | 147,262 | $ 143,819 | $ 140,014 |  | 121,665
Adjustments Due to ASC 606 [Member] |  |  |  |  |
Trade accounts receivable, net |  |  |  |  | (30,223)
Inventories |  |  |  |  | 1,975
Unbilled receivables on uncompleted contracts |  |  |  |  | (9,996)
Contract assets - current portion |  |  |  |  | 45,468
Other Assets |  |  |  |  |
Total Assets |  |  |  |  | 7,224
Contract liabilities - current |  |  |  |  | 18,945
Current portion of customer advances on uncompleted contracts |  |  |  |  | (11,429)
Other current liabilities |  |  |  |  | (105)
Customer advances on uncompleted contracts - non-current |  |  |  |  | (1,571)
Contract liabilities - non-current |  |  |  |  | 1,571
Other Liabilities |  |  |  |  |
Total liabilities |  |  |  |  | 7,411
Retained earnings |  |  |  |  | (187)
Total shareholders' equity |  |  |  |  | (187)
As Adjusted Under ASC 606 [Member] |  |  |  |  |
Trade accounts receivable, net | 91,852 |  |  |  | 80,241
Inventories | 88,452 |  |  |  | 73,631
Unbilled receivables on uncompleted contracts |  |  |  |  |
Contract assets - current portion | 45,836 |  |  |  | 45,468
Other Assets | 258,903 |  |  |  | 275,884
Contract assets - Non-current | 5,531 |  |  |  |
Total Assets | 490,574 |  |  |  | 475,224
Contract liabilities - current | 17,915 |  |  |  | 18,945
Current portion of customer advances on uncompleted contracts |  |  |  |  |
Other current liabilities | 92,317 |  |  |  | 13,521
Customer advances on uncompleted contracts - non-current |  |  |  |  |
Contract liabilities - non-current | 1,750 |  |  |  | 1,571
Other Liabilities | 231,330 |  |  |  | 319,709
Total liabilities | 343,312 |  |  |  | 353,746
Retained earnings | 20,071 |  |  |  | 22,025
Total shareholders' equity | 147,262 |  |  |  | $ 121,478
Under ASC 605 [Member] |  |  |  |  |
Trade accounts receivable, net | 122,411 |  |  |  |
Inventories | 87,214 |  |  |  |
Unbilled receivables on uncompleted contracts | 17,071 |  |  |  |
Contract assets - current portion |  |  |  |  |
Other Assets | 259,217 |  |  |  |
Contract assets - Non-current |  |  |  |  |
Total Assets | 485,913 |  |  |  |
Contract liabilities - current |  |  |  |  |
Current portion of customer advances on uncompleted contracts | 12,828 |  |  |  |
Other current liabilities | 92,317 |  |  |  |
Customer advances on uncompleted contracts - non-current | 1,750 |  |  |  |
Contract liabilities - non-current |  |  |  |  |
Other Liabilities | 231,672 |  |  |  |
Total liabilities | 338,567 |  |  |  |
Retained earnings | 20,155 |  |  |  |
Total shareholders' equity | 147,346 |  |  |  |
Effect of ASC 606 [Member] |  |  |  |  |
Trade accounts receivable, net | (30,559) |  |  |  |
Inventories | 1,238 |  |  |  |
Unbilled receivables on uncompleted contracts | 17,071 |  |  |  |
Contract assets - current portion | 45,836 |  |  |  |
Other Assets | (314) |  |  |  |
Contract assets - Non-current | 5,531 |  |  |  |
Total Assets | 4,661 |  |  |  |
Contract liabilities - current | 17,915 |  |  |  |
Current portion of customer advances on uncompleted contracts | (12,828) |  |  |  |
Other current liabilities |  |  |  |  |
Customer advances on uncompleted contracts - non-current | (1,750) |  |  |  |
Contract liabilities - non-current | 1,750 |  |  |  |
Other Liabilities | (342) |  |  |  |
Total liabilities | 4,745 |  |  |  |
Retained earnings | (84) |  |  |  |
Total shareholders' equity | $ (84) |  |  |  |

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