Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net income	$ 41,074	$ 78,419
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,768	25,359
Amortization and impairment of other intangible assets	7,797	8,041
Acquisition-related contingent consideration	1,547	1,541
Provision for doubtful accounts	10,510	5,903
Non-cash share-based compensation	12,888	13,381
Non-cash interest expense	1,489	1,489
Other	297	(1,159)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(72,640)	(67,318)
Notes receivable	8,449	(3,674)
Prepaid expenses and other assets	935	(3,575)
Accounts payable, accrued expenses and other	16,823	10,900
Income taxes	8,876	28,204
Accrued compensation	(34,123)	4,486
Billings in excess of services provided	(3,657)	9,578
Net cash provided by operating activities	24,033	111,575
Investing activities
Payments for acquisition of businesses, net of cash received	(8,929)	(56)
Purchases of property and equipment	(20,021)	(22,855)
Other	74	74
Net cash used in investing activities	(28,876)	(22,837)
Financing activities
Borrowings under revolving line of credit, net	95,000	(25,000)
Deposits	3,585	2,806
Purchase and retirement of common stock	(155,285)	(2,903)
Net issuance of common stock under equity compensation plans	(2,354)	18,394
Other	(79)	357
Net cash used in financing activities	(59,133)	(6,346)
Effect of exchange rate changes on cash and cash equivalents	5,779	(6,968)
Net increase (decrease) in cash and cash equivalents	(58,197)	75,424
Cash and cash equivalents, beginning of period	216,158	149,760
Cash and cash equivalents, end of period	157,961	225,184
Supplemental cash flow disclosures
Cash paid for interest	12,424	12,590
Cash paid for income taxes, net of refunds	8,742	15,909
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 1,547	$ 1,842

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.