Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net income	$ 56,747	$ 62,645
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	7,823	7,066
Amortization and impairment of other intangible assets	2,331	1,861
Acquisition-related contingent consideration	506	93
Provision for doubtful accounts	3,872	3,784
Share-based compensation	7,454	6,393
Amortization of debt discount and issuance costs	2,978	2,860
Deferred income taxes	545	8,752
Other	0	(42)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(60,963)	(95,746)
Notes receivable	7,051	9,653
Prepaid expenses and other assets	9,442	5,979
Accounts payable, accrued expenses and other	11,136	(450)
Income taxes	(667)	2,534
Accrued compensation	(176,070)	(123,260)
Billings in excess of services provided	4,253	5,792
Net cash used in operating activities	(123,562)	(102,086)
Investing activities
Purchases of property and equipment	(8,236)	(10,153)
Other	8	72
Net cash used in investing activities	(8,228)	(10,081)
Financing activities
Borrowings under revolving line of credit	55,000	0
Repayments under revolving line of credit	(5,000)	0
Purchase and retirement of common stock	(49,135)	(21,883)
Net issuance of common stock under equity compensation plans	(5,583)	(605)
Payments for business acquisition liabilities	0	(1,282)
Deposits and other	3,870	1,003
Net cash used in financing activities	(848)	(22,767)
Effect of exchange rate changes on cash and cash equivalents	(13,672)	2,106
Net decrease in cash and cash equivalents	(146,310)	(132,828)
Cash and cash equivalents, beginning of period	369,373	312,069
Cash and cash equivalents, end of period	223,063	179,241
Supplemental cash flow disclosures
Cash paid for interest	3,136	3,450
Cash paid for income taxes, net of refunds	16,588	8,644
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 2,314	$ 1,346

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.