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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net income | $ 23,641 | $ 23,899
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 6,672 | 5,102
Bad debt (recovery)/expense | (517) | 552
Deferred taxes | 2,595 | (482)
Stock-based compensation expense | 15,776 | 10,964
Excess tax benefit on stock-based compensation plans | 0 | (2,040)
Other | 651 | 50
(Increase)/decrease in operating assets: |  |
Accounts receivable | 24,635 | 16,993
Unbilled revenues | (39,485) | (18,559)
Prepaid expenses and other assets | (79) | (1,383)
Increase/(decrease) in operating liabilities: |  |
Accounts payable | 77 | 671
Accrued expenses and other liabilities | (18,484) | (34,153)
Due to employees | 8,611 | 12,420
Taxes payable | 7,135 | (3,173)
Net cash provided by operating activities | 31,228 | 10,861
Cash flows from investing activities: |  |
Purchases of property and equipment | (5,725) | (6,185)
Employee housing loans issued | 370 | 0
Proceeds from repayments of employee housing loans | 689 | 470
Decrease in restricted cash and time deposits, net | 38 | 30,000
Increase in other long-term assets, net | (313) | (774)
Other investing activities, net | 37 | (91)
Net cash (used in)/provided by investing activities | (5,644) | 23,420
Cash flows from financing activities: |  |
Proceeds from stock option exercises | 10,606 | 3,108
Excess tax benefit on stock-based compensation plans | 0 | 2,040
Payments of withholding taxes related to net share settlements of restricted stock units | (2,694) | 0
Proceeds from debt (Note 4) | 0 | 20,000
Repayment of debt (Note 4) | (30) | (15,031)
Proceeds from government grants | 0 | 135
Acquisition of business, deferred consideration | 0 | (463)
Net cash provided by financing activities | 7,882 | 9,789
Effect of exchange rate changes on cash and cash equivalents | 2,928 | 1,358
Net increase in cash and cash equivalents | 36,394 | 45,428
Cash and cash equivalents, beginning of period | 362,025 | 199,449
Cash and cash equivalents, end of period | $ 398,419 | $ 244,877

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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