Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 82,554	$ 8,860
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	16,253	16,298
Amortization and impairment of other intangible assets	4,322	4,915
Acquisition-related contingent consideration	232	1,172
Provision for doubtful accounts	8,710	5,971
Non-cash share-based compensation	8,563	9,959
Non-cash interest expense and other	993	992
Other	798	242
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(99,299)	(78,100)
Notes receivable	4,214	2,241
Prepaid expenses and other assets	(4,151)	947
Accounts payable, accrued expenses and other	352	(1,887)
Income taxes	13,143	3,087
Accrued compensation	(58,547)	(64,531)
Billings in excess of services provided	(12,722)	7,634
Net cash used in operating activities	(34,585)	(82,200)
Investing activities
Purchases of property and equipment	(16,220)	(13,127)
Other	689	72
Net cash used in investing activities	(15,531)	(13,055)
Financing activities
Borrowings (repayments) under revolving line of credit, net	(25,000)	115,000
Deposits	2,602	3,262
Purchase and retirement of common stock	(14,220)	(102,513)
Net issuance of common stock under equity compensation plans	18,740	(500)
Payments for acquisition-related contingent consideration	(3,029)	(79)
Net cash provided by (used in) financing activities	(20,907)	15,170
Effect of exchange rate changes on cash and cash equivalents	(2,382)	2,438
Net decrease in cash and cash equivalents	(73,405)	(77,647)
Cash and cash equivalents, beginning of period	189,961	216,158
Cash and cash equivalents, end of period	116,556	138,511
Supplemental cash flow disclosures
Cash paid for interest	13,020	14,903
Cash paid for income taxes, net of refunds	16,137	5,336
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 1,059	$ 1,547

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.