Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income	$ 127,278	$ 104,921
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	16,765	15,707
Amortization and impairment of intangible assets	5,655	4,645
Acquisition-related contingent consideration	(1,130)	1,120
Provision for expected credit losses	8,236	11,624
Share-based compensation	12,190	12,147
Amortization of debt discount and issuance costs and other	5,685	6,000
Deferred income taxes	9,802	4,128
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(138,838)	(42,804)
Notes receivable	8,921	5,993
Prepaid expenses and other assets	6,728	8,979
Accounts payable, accrued expenses and other	(13,518)	2,230
Income taxes	6,695	(2,344)
Accrued compensation	(88,024)	(107,217)
Billings in excess of services provided	(7,471)	4,285
Net cash provided by (used in) operating activities	(41,026)	29,414
Investing activities
Payments for acquisition of businesses, net of cash received	(9,833)	0
Purchases of property and equipment and other	(27,696)	(13,885)
Net cash used in investing activities	(37,529)	(13,885)
Financing activities
Borrowings under revolving line of credit	292,500	90,000
Repayments under revolving line of credit	(192,500)	(55,000)
Purchase and retirement of common stock	(46,133)	(99,678)
Share-based compensation tax withholdings and other	(7,475)	(6,523)
Payments for business acquisition liabilities	(7,496)	(3,948)
Deposits	602	5,098
Net cash provided by (used in) financing activities	39,498	(70,051)
Effect of exchange rate changes on cash and cash equivalents	979	(10,645)
Net decrease in cash and cash equivalents	(38,078)	(65,167)
Cash and cash equivalents, beginning of period	294,953	369,373
Cash and cash equivalents, end of period	256,875	304,206
Supplemental cash flow disclosures
Cash paid for interest	4,854	3,668
Cash paid for income taxes, net of refunds	18,742	29,150
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	2,603	2,314
Purchase and retirement of common stock not yet paid	0	1,829
Business acquisition liabilities not yet paid	1,093	0
Non-cash additions to property and equipment	$ 4,150	$ 1,501

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets, combined with the amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of indefinite-lived intangible assets, other than goodwill, to fair value. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

No definition available.