Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net income	$ 78,419	$ 55,704
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,359	22,569
Amortization and impairment of other intangible assets	8,041	8,919
Acquisition-related contingent consideration	1,541	(1,145)
Provision for doubtful accounts	5,903	10,364
Non-cash share-based compensation	13,381	14,356
Non-cash interest expense	1,489	2,029
Loss on early extinguishment of debt		19,589
Other	(1,159)	(674)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(67,318)	(84,411)
Notes receivable	(3,674)	(334)
Prepaid expenses and other assets	(3,575)	(4,396)
Accounts payable, accrued expenses and other	10,900	10,158
Income taxes	28,204	15,371
Accrued compensation	4,486	(19,518)
Billings in excess of services provided	9,578	(5,278)
Net cash provided by operating activities	111,575	43,303
Investing activities
Payments for acquisition of businesses, net of cash received	(56)	(575)
Purchases of property and equipment	(22,855)	(24,674)
Other	74	94
Net cash used in investing activities	(22,837)	(25,155)
Financing activities
Borrowings (repayments) under revolving line of credit, net	(25,000)	220,000
Payments of long-term debt		(425,671)
Payments of debt issue costs		(3,701)
Deposits	2,806	2,406
Purchase and retirement of common stock	(2,903)
Net issuance of common stock under equity compensation plans	18,394	13,931
Other	357	124
Net cash used in financing activities	(6,346)	(192,911)
Effect of exchange rate changes on cash and cash equivalents	(6,968)	(3,943)
Net increase (decrease) in cash and cash equivalents	75,424	(178,706)
Cash and cash equivalents, beginning of period	149,760	283,680
Cash and cash equivalents, end of period	225,184	104,974
Supplemental cash flow disclosures
Cash paid for interest	12,590	37,031
Cash paid for income taxes, net of refunds	15,909	16,386
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 1,842	$ 2,124

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.