CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 145,600	$ 119,423
Accounts receivable, net	366,285	338,242
Inventories	217,184	183,095
Prepaid expenses and other current assets	76,643	69,496
Total current assets	805,712	710,256
NONCURRENT ASSETS:
Property and equipment, net	109,066	111,535
Operating lease right-of-use asset	74,662	74,777
Intangible assets, net	20,669	21,433
Referral sources	337,882	344,587
Goodwill	1,478,500	1,477,564
Deferred income taxes	14,037	27,033
Other noncurrent assets	37,748	23,733
Total noncurrent assets	2,072,564	2,080,662
TOTAL ASSETS	2,878,276	2,790,918
CURRENT LIABILITIES:
Accounts payable	356,118	279,246
Accrued compensation and employee benefits	42,046	83,503
Accrued expenses and other current liabilities	85,286	71,857
Current portion of operating lease liability	18,689	19,089
Current portion of long-term debt	6,000	6,000
Total current liabilities	508,139	459,695
NONCURRENT LIABILITIES:
Long-term debt, net of discount, deferred financing costs and current portion	1,059,449	1,059,900
Operating lease liability, net of current portion	75,479	74,492
Other noncurrent liabilities	13,445	20,945
Total noncurrent liabilities	1,148,373	1,155,337
Total liabilities	1,656,512	1,615,032
STOCKHOLDERS’ EQUITY:
Preferred stock; $0.0001 par value; 12,500,000 shares authorized, no shares outstanding as of March 31, 2022 and December 31, 2021, respectively	0	0
Common stock; $0.0001 par value: 250,000,000 shares authorized, 180,429,758 shares issued and 180,046,036 shares outstanding as of March 31, 2022; 180,309,637 shares issued and 179,925,915 shares outstanding as of December 31, 2021	18	18
Treasury stock; 383,722 shares outstanding, at cost, as of March 31, 2022 and December 31, 2021, respectively	(2,403)	(2,403)
Paid-in capital	1,143,388	1,138,855
Retained earnings	70,142	39,867
Accumulated other comprehensive income (loss)	10,619	(451)
Total stockholders’ equity	1,221,764	1,175,886
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,878,276	$ 2,790,918