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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 8,983 | $ 51,167
Contracts receivable, net | 28,466 | 20,169
Contracts in progress | 28,373 | 26,829
Prepaid expenses and other | 3,833 | 3,222
Inventory | 4,933 | 11,973
Assets held for sale | 104,576 | 0
Total current assets | 179,164 | 113,360
Property, plant and equipment, net | 88,899 | 206,222
Other assets | 2,777 | 2,826
Total assets | 270,840 | 322,408
Current liabilities: |  |
Accounts payable | 18,375 | 9,021
Advance billings on contracts | 5,136 | 3,977
Deferred revenue, current | 4,676 | 11,881
Accrued contract losses | 7,618 | 387
Accrued expenses and other liabilities | 12,741 | 10,032
Income taxes payable | 119 | 50
Total current liabilities | 48,665 | 35,348
Net deferred tax liabilities | 0 | 23,234
Deferred revenue, noncurrent | 769 | 489
Other liabilities | 1,913 | 305
Total liabilities | 51,347 | 59,376
Shareholders’ equity: |  |
Preferred stock, no par value, 5,000,000 shares authorized, no shares issued and outstanding |  |
Common stock, no par value, 20,000,000 shares authorized, 14,910,498 issued and outstanding at December 31, 2017 and 14,695,020 at December 31, 2016, respectively | 10,823 | 10,641
Additional paid-in capital | 100,456 | 98,813
Retained earnings | 108,214 | 153,578
Total shareholders’ equity | 219,493 | 263,032
Total liabilities and shareholders’ equity | $ 270,840 | $ 322,408

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(14)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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