Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 88,366,000	$ 73,269,000
Adjustments to reconcile net income to net cash flow from (used in) operating activities:
Depreciation and amortization	51,281,000	39,470,000
Noncash lease expense	20,738,000	20,949,000
Deferred income taxes	11,127,000	9,773,000
Stock-based compensation expense	8,533,000	5,188,000
Bad debt expense	5,244,000	0
Contract loss reserve	(372,000)	(881,000)
Loss on sale and retirement of property and equipment	12,000	7,000
Equity in (earnings) losses of unconsolidated subsidiaries	1,000	(4,000)
Change in assets and liabilities—net of effects from acquired businesses:
Receivables—net	10,877,000	60,182,000
Prepaid expenses	(7,838,000)	(5,609,000)
Taxes receivable—current	(5,825,000)	(1,653,000)
Other current assets	(1,333,000)	586,000
Employee supplemental savings plan asset	(2,042,000)	(4,396,000)
Other long-term assets	(1,939,000)	40,000
Accounts payable and accrued expenses	22,565,000	28,888,000
Accrued salaries and related expenses	29,812,000	9,830,000
Operating lease obligations	(22,102,000)	(21,077,000)
Contract liabilities	12,438,000	15,682,000
Accrued retirement	(2,328,000)	2,655,000
Other long-term liabilities	100,000	273,000
Other	(182,000)	(213,000)
Net cash flow from operating activities	217,133,000	232,959,000
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(53,685,000)	(38,455,000)
Investment in capitalized software	(5,193,000)	(2,784,000)
Proceeds from corporate owned life insurance	4,137,000	0
Proceeds from sale of property and equipment	869,000	0
Acquisition of a business-net of cash acquired	0	(153,180,000)
Deferred contract costs	0	(3,520,000)
Proceeds from equity method investment	0	283,000
Net cash used in investing activities	(53,872,000)	(197,656,000)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Borrowing under revolving credit facility	285,500,000	465,500,000
Repayments under revolving credit facility	(322,000,000)	(448,000,000)
Dividends paid	(38,689,000)	(32,365,000)
Proceeds from exercise of stock options	5,918,000	9,156,000
Payment consideration to tax authority on employees' behalf	(1,014,000)	(1,476,000)
Principal paid on financing leases	(118,000)	(99,000)
Net cash used in financing activities	(70,403,000)	(7,284,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	92,858,000	28,019,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	8,854,000	5,294,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	101,712,000	33,313,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	1,568,000	1,938,000
Cash paid for income taxes, net of refunds	22,619,000	16,117,000
Noncash investing and financing activities:
Operating lease obligations arising from obtaining right of use assets	6,459,000	18,527,000
Finance lease obligations arising from obtaining right of use assets	107,000	368,000
Noncash investing activities	$ 5,480,000	$ 1,333,000