Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,589	$ 128	$ 8,684
Restricted cash	0	958
Accounts receivable:
Trade, net of allowance for credit losses of $411 and $2,600, respectively	96,369	116,540
Retainage	36,485	42,547
Income taxes receivable	419	962
Other current	59,492	2,680
Inventory	1,548	1,114
Costs and estimated earnings in excess of billings on uncompleted contracts	32,271	41,389
Prepaid expenses and other	7,229	5,647
Total current assets	235,402	211,965
Property and equipment, net of depreciation	125,497	132,348
Operating lease right-of-use assets, net of amortization	18,874	17,997
Financing lease right-of-use assets, net of amortization	12,858	7,896
Inventory, non-current	6,455	7,037
Intangible assets, net of amortization	10,077	12,147
Deferred income tax asset	70	85
Other non-current	4,956	5,369
Total assets	414,189	394,844
Current liabilities:
Current debt, net of debt issuance costs	4,344	3,668
Accounts payable:
Trade	48,252	70,421
Retainage	716	562
Accrued liabilities	84,637	16,966
Income taxes payable	639	1,523
Billings in excess of costs and estimated earnings on uncompleted contracts	33,135	48,781
Current portion of operating lease liabilities	4,989	5,043
Current portion of financing lease liabilities	3,901	2,788
Total current liabilities	180,613	149,752
Long-term debt, net of debt issuance costs	29,523	68,029
Operating lease liabilities	14,537	13,596
Financing lease liabilities	8,376	3,760
Other long-term liabilities	19,837	20,436
Deferred income tax liability	207	205
Interest rate swap liability	1,602	1,045
Total liabilities	254,695	256,823
Stockholders? equity:
Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued	0	0
Common stock -- $0.01 par value, 50,000,000 authorized, 31,171,804 and 30,303,395 issued; 30,460,573 and 29,592,164 outstanding at December 31, 2020 and December 31, 2019, respectively	312	303
Treasury stock, 711,231 shares, at cost, as of December 31, 2020 and December 31, 2019, respectively	(6,540)	(6,540)
Accumulated other comprehensive loss	(1,602)	(1,045)
Additional paid-in capital	184,324	182,523
Retained loss	(17,000)	(37,220)
Total stockholders' equity	159,494	138,021	$ 141,585
Total liabilities and stockholders' equity	$ 414,189	$ 394,844