CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 173,259	$ 150,723
Accounts receivable, net of allowances	344,645	298,440
Inventories, net	324,458	309,279
Contract assets	36,759	32,348
Prepaid expenses and other current assets	66,407	56,249
Total current assets	945,528	847,039
Property and equipment, net of accumulated depreciation	338,361	294,327
Operating lease right-of-use assets	125,093	0
Customer relationship intangible assets, net of accumulated amortization	178,526	158,563
Other intangible assets, net of accumulated amortization	645	325
Goodwill	283,366	262,997
Other long-term assets	8,669	12,860
Total assets	1,880,188	1,576,111
Current liabilities
Accounts payable	201,709	123,495
Accrued expenses and other liabilities	103,003	110,276
Contract liabilities	34,501	34,888
Income taxes payable	8,879	902
Interest payable	9,572	4,759
Current portion: Long-term debt and finance lease obligations	6,369
Current portion: Long-term debt and finance lease obligations		6,661
Current portion: Operating lease liabilities	24,343	0
Current portion: Insurance reserves	19,358	15,198
Total current liabilities	407,734	296,179
Insurance reserves	43,506	41,270
Long-term debt	345,823	345,197
Long-term portion of finance lease obligations	9,832
Long-term portion of finance lease obligations		8,845
Long-term portion of operating lease liabilities	107,498	0
Deferred income taxes	7,891	3,034
Other long-term liabilities	323	6,927
Total liabilities	922,607	701,452
Commitments and contingencies (Note 9)
Stockholders’ equity
Preferred stock, $0.01 par value, 50.0 million shares authorized, no shares issued and outstanding at September 30, 2019 and December 31, 2018	0	0
Common stock, $0.01 par value, 300.0 million shares authorized, 68.3 million and 67.7 million shares issued, and 66.8 million and 67.2 million outstanding at September 30, 2019 and December 31, 2018, respectively	683	677
Additional paid-in capital	683,460	672,095
Retained earnings	299,991	210,345
Treasury stock, at cost, 1.5 million and 0.5 million shares at September 30, 2019 and December 31, 2018, respectively	(26,553)	(8,458)
Total stockholders’ equity	957,581	874,659
Total liabilities and stockholders’ equity	$ 1,880,188	$ 1,576,111