CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,682	$ 23,846
Accounts receivable, net of allowances of $606 and $432, respectively	274,249	234,642
Costs and estimated earnings in excess of billings on uncompleted contracts	107,818	69,950
Current portion of receivable for insurance claims in excess of deductibles	4,003	3,785
Refundable income taxes, net	403	2,474
Other current assets	5,279	8,202
Total current assets	393,434	342,899
Property and equipment, net of accumulated depreciation of $228,185 and $209,466, respectively	150,248	154,891
Goodwill	46,981	46,781
Intangible assets, net of accumulated amortization of $5,262 and $4,684, respectively	10,769	11,566
Receivable for insurance claims in excess of deductibles	14,766	14,692
Other assets	4,399	2,666
Total assets	620,597	573,495
Current liabilities:
Current portion of capital lease obligations	1,109	1,085
Accounts payable	119,172	99,942
Billings in excess of costs and estimated earnings on uncompleted contracts	43,851	42,321
Current portion of accrued self insurance	12,083	10,492
Other current liabilities	37,444	42,382
Total current liabilities	213,659	196,222
Deferred income tax liabilities	18,263	18,565
Long-term debt	79,497	59,070
Accrued self insurance	33,146	32,092
Capital lease obligations, net of current maturities	2,997	3,833
Other liabilities	475	539
Total liabilities	348,037	310,321
Commitments and contingencies
Stockholders' equity:
Preferred stock—$0.01 par value per share; 4,000,000 authorized shares;none issued and outstanding at September 30, 2017 and December 31, 2016	0	0
Common stock—$0.01 par value per share; 100,000,000 authorized shares; 16,458,523 and 16,333,139 shares issued and outstanding at September 30, 2017 and December	163	162
Additional paid-in capital	142,952	140,100
Accumulated other comprehensive loss	(217)	(433)
Retained earnings	129,662	123,345
Total stockholders’ equity	272,560	263,174
Total liabilities and stockholders’ equity	$ 620,597	$ 573,495

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount 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, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.