CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 282,815	$ 165,496
Accounts receivable, net of allowances of $9,984 and $8,318 at March 31, 2020 and December 31, 2019, respectively	351,672	325,741
Inventories	361,661	331,969
Contract assets	38,339	32,125
Income taxes receivable	10,416	7,504
Prepaid expenses and other current assets	70,499	66,818
Total current assets	1,115,402	929,653
Property and equipment, net of accumulated depreciation	360,047	345,466
Operating lease right-of-use assets	133,700	139,907
Customer relationship intangible assets, net of accumulated amortization	180,101	185,049
Other intangible assets, net of accumulated amortization	515	580
Goodwill	295,401	297,146
Other long-term assets	8,274	8,300
Total assets	2,093,440	1,906,101
Current liabilities
Accounts payable	226,471	189,644
Accrued expenses and other liabilities	86,656	117,825
Contract liabilities	37,859	31,094
Interest payable	9,697	4,759
Current portion: Long-term debt and finance lease obligations	4,660	5,577
Current portion: Operating lease liabilities	26,272	26,147
Current portion: Insurance reserves	18,588	16,328
Total current liabilities	410,203	391,374
Insurance reserves	43,500	43,536
Long-term debt	490,241	346,032
Long-term portion of finance lease obligations	6,228	6,959
Long-term portion of operating lease liabilities	114,436	120,832
Deferred income taxes	25,492	15,195
Other long-term liabilities	280	661
Total liabilities	1,090,380	924,589
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, 2020 and December 31, 2019	0	0
Common stock, $0.01 par value, 300.0 million shares authorized, 68.7 million and 68.3 million shares issued, and 67.0 million and 66.8 million outstanding at March 31, 2020 and December 31, 2019, respectively	687	683
Additional paid-in capital	690,627	687,255
Retained earnings	342,219	320,190
Treasury stock, at cost, 1.7 million and 1.5 million shares at March 31, 2020 and December 31, 2019, respectively	(30,473)	(26,616)
Total stockholders’ equity	1,003,060	981,512
Total liabilities and stockholders’ equity	$ 2,093,440	$ 1,906,101