Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 64,874	$ 41,193
Receivables—net	458,844	400,621
Prepaid expenses	35,432	26,243
Taxes receivable—current	16,721	21,968
Other current assets	7,756	6,354
Total Current Assets	583,627	496,379
Goodwill	1,237,734	1,237,894
Other intangible assets—net	189,082	202,231
Property and equipment—net	128,555	121,296
Operating lease right of use assets	85,224	94,825
Employee supplemental savings plan assets	40,457	37,848
Investments	11,548	11,549
Other assets	12,646	11,642
TOTAL ASSETS	2,288,873	2,213,664
LIABILITIES
Accounts payable	170,612	142,360
Accrued salaries and related expenses	125,220	123,953
Operating lease obligations—current	31,087	30,105
Contract liabilities	30,610	37,218
Accrued expenses and other current liabilities	9,780	15,177
Total Current Liabilities	367,309	348,813
Deferred income taxes	144,912	141,638
Operating lease obligations—long term	71,213	80,242
Accrued retirement	34,333	36,310
Long-term debt	30,000	15,000
Other long-term liabilities	12,130	12,249
TOTAL LIABILITIES	659,897	634,252
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Additional paid-in capital	557,211	545,717
Treasury stock	(9,158)	(9,158)
Retained earnings	1,080,762	1,042,676
Accumulated other comprehensive loss	(249)	(230)
TOTAL STOCKHOLDERS' EQUITY	1,628,976	1,579,412
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,288,873	2,213,664
Class A common stock
STOCKHOLDERS' EQUITY
Common stock	278	275
TOTAL STOCKHOLDERS' EQUITY	278	275
Class B common stock
STOCKHOLDERS' EQUITY
Common stock	132	132
TOTAL STOCKHOLDERS' EQUITY	$ 132	$ 132