CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 191,435	$ 231,520
Accounts receivable (less allowance for credit losses of $8,784 and $8,789 at September 30, 2021 and December 31, 2020, respectively)	306,590	266,566
Inventories	118,093	77,179
Prepaid expenses and other current assets	56,803	48,678
Total current assets	672,921	623,943
Non-current assets
Property and equipment, net	104,977	104,022
Operating lease right-of-use assets	61,028	53,766
Goodwill	257,106	216,870
Customer relationships, net	204,100	171,393
Other non-current assets	26,996	17,682
Total assets	1,327,128	1,187,676
Current liabilities
Current maturities of long-term debt	24,557	23,355
Current maturities of operating lease obligations	21,278	18,758
Current maturities of finance lease obligations	1,780	2,073
Accounts payable	119,583	101,462
Accrued compensation	60,623	45,876
Other current liabilities	56,970	44,951
Total current liabilities	284,791	236,475
Long-term debt	542,517	541,957
Operating lease obligations	39,155	34,413
Finance lease obligations	3,038	2,430
Deferred income taxes	9,035	35
Other long-term liabilities	55,866	53,184
Total liabilities	934,402	868,494
Commitments and contingencies
Stockholders’ equity
Preferred Stock; $0.01 par value: 5,000,000 authorized and 0 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	0	0
Common stock; $0.01 par value: 100,000,000 authorized, 33,271,659 and 33,141,879 issued and 29,707,155 and 29,623,272 shares outstanding at September 30, 2021 and December 31, 2020, respectively	333	331
Additional paid in capital	208,535	199,847
Retained earnings	332,087	269,420
Treasury stock; at cost: 3,564,504 and 3,518,607 shares at September 30, 2021 and December 31, 2020, respectively	(147,228)	(141,653)
Accumulated other comprehensive loss	(1,001)	(8,763)
Total stockholders’ equity	392,726	319,182
Total liabilities and stockholders’ equity	1,327,128	1,187,676
Customer relationships
Non-current assets
Customer relationships, net	133,759	108,504
Intangible Assets Excluding Customer Relationships
Non-current assets
Customer relationships, net	$ 70,341	$ 62,889