CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 141,582	$ 150,723
Accounts receivable, net of allowances	320,088	298,440
Inventories, net	315,323	309,279
Contract assets	33,778	32,348
Prepaid expenses and other current assets	58,677	56,249
Total current assets	869,448	847,039
Property and equipment, net of accumulated depreciation	303,049	294,327
Operating lease right-of-use assets	109,448	0
Customer relationship intangible assets, net of accumulated amortization	177,503	158,563
Other intangible assets, net of accumulated amortization	508	325
Goodwill	275,845	262,997
Other long-term assets	9,386	12,860
Total assets	1,745,187	1,576,111
Current liabilities
Accounts payable	199,265	123,495
Accrued expenses and other liabilities	78,127	110,276
Contract liabilities	32,961	34,888
Income taxes payable	160	902
Interest payable	9,572	4,759
Current portion: Long-term debt and finance lease obligations	6,497
Current portion: Long-term debt and finance lease obligations		6,661
Current portion: Operating lease liabilities	23,820	0
Current portion: Insurance reserves	16,202	15,198
Total current liabilities	366,604	296,179
Insurance reserves	43,388	41,270
Long-term debt	345,405	345,197
Long-term portion of finance lease obligations	7,301
Long-term portion of finance lease obligations		8,845
Long-term portion of operating lease liabilities	91,380	0
Deferred income taxes	9,805	3,034
Other long-term liabilities	287	6,927
Total liabilities	864,170	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 March 31, 2019 and December 31, 2018	0	0
Common stock, $0.01 par value, 300.0 million shares authorized, 68.0 million and 67.7 million shares issued, and 66.5 million and 67.2 million outstanding at March 31, 2019 and December 31, 2018, respectively	680	677
Additional paid-in capital	675,139	672,095
Retained earnings	230,695	210,345
Treasury stock, at cost, 1.5 million and 0.5 million shares at March 31, 2019 and December 31, 2018, respectively	(25,497)	(8,458)
Total stockholders’ equity	881,017	874,659
Total liabilities and stockholders’ equity	$ 1,745,187	$ 1,576,111