CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 9,002	$ 11,750
Accounts receivable, net of allowances	353,749	322,892
Inventories, net	338,767	309,060
Contract assets	36,613	0
Costs in excess of billings on uncompleted contracts	0	28,738
Income taxes receivable	2,288	3,748
Prepaid expenses and other current assets	55,055	57,949
Total current assets	795,474	734,137
Property and equipment, net of accumulated depreciation	295,897	295,820
Customer relationship intangible assets, net of accumulated amortization	169,783	166,306
Other intangible assets, net of accumulated amortization	1,222	1,306
Goodwill	263,999	261,792
Other long-term assets	17,133	13,989
Total assets	1,543,508	1,473,350
Current liabilities
Accounts payable	216,558	174,583
Accrued expenses and other liabilities	83,052	96,262
Contract liabilities	29,089	0
Billings in excess of costs on uncompleted contracts	0	18,428
Interest payable	9,597	4,769
Current portion: Long-term debt and capital lease obligations	7,373	7,739
Current portion: Insurance reserves	13,786	13,496
Total current liabilities	359,455	315,277
Insurance reserves	38,251	38,470
Long-term debt	356,971	349,059
Long-term portion of capital lease obligations	13,146	14,838
Deferred income taxes	5,578	1,768
Other long-term liabilities	6,532	7,039
Total liabilities	779,933	726,451
Commitments and contingencies (Note 8)
Stockholders' equity
Preferred stock, $0.01 par value, 50.0 million shares authorized, no shares issued and outstanding at March 31, 2018 and December 31, 2017	0	0
Common stock, $0.01 par value, 300.0 million shares authorized, 67.5 million and 67.3 million shares issued, and 67.2 million and 67.1 million outstanding at March 31, 2018 and December 31, 2017, respectively	675	673
Additional paid-in capital	661,818	659,440
Retained earnings	105,966	90,607
Treasury stock, at cost, 0.3 million and 0.2 million shares at March 31, 2018 and December 31, 2017, respectively	(4,884)	(3,821)
Total stockholders' equity	763,575	746,899
Total liabilities and stockholders' equity	$ 1,543,508	$ 1,473,350