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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities: |  |  |
Net income | $ 90,908 | $ 105,931 | $ 5,035
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 17,195 | 21,214 | 25,295
Bad debt expense | 224 | 884 | 2,969
Unrealized net loss (gain) on foreign currency forward contracts | 0 | 1,641 | (1,682)
Non-cash restructuring costs and adjustments | 0 | (136) | 199
Deferred taxes | (4,983) | 9,666 | (1,526)
Release of liabilities for unrecognized tax benefits | (394) | (899) | 0
Share-based compensation expense | 11,817 | 17,299 | 11,786
Excess tax benefits from share-based compensation arrangements | (1,244) | (1,096) | 0
Reclassification of foreign currency translation adjustment from other comprehensive income | 0 | (280) | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (16,878) | 5,003 | (276)
Prepaid expenses and other current assets | (880) | 4,446 | (2,713)
Deposits and other assets | (4,059) | 1,631 | 909
Accounts payable and accrued expenses | 6,981 | 1,904 | (1,701)
Accrued compensation and employee benefits | 3,787 | (8,387) | (26,875)
Accrued restructuring costs | (58) | (1,922) | 2,379
Deferred revenue and advance payments | 11,238 | (4,176) | 731
Other long-term liabilities | (3,065) | (3,024) | 70
Net cash provided by operating activities | 110,589 | 149,699 | 14,600
Investing activities: |  |  |
Proceeds from redemption of short-term investments | 361,680 | 479,200 | 308,900
Purchases of property and equipment | (2,337) | (3,484) | (12,400)
Purchases of short-term investments | (354,999) | (473,779) | (370,050)
Capitalized software development costs | 0 | (9,598) | (8,396)
Increase in restricted cash | (135) | (20) | (164)
Net cash provided by (used in) investing activities | 4,209 | (7,681) | (82,110)
Financing activities: |  |  |
Proceeds from sale of class A common stock under exercise of employee stock options | 1,663 | 9,529 | 856
Payment of taxes relating to net exercise of employee stock options | (3,739) | 0 | 0
Excess tax benefits from share-based compensation arrangements | 1,244 | 1,096 | 0
Payments on capital lease obligations and other financing arrangements | (172) | (1,447) | (2,326)
Net cash (used in) provided by financing activities | (1,004) | 9,178 | (1,470)
Effect of foreign exchange rate changes on cash and cash equivalents | (4,160) | (5,774) | (4,272)
Net increase (decrease) in cash and cash equivalents | 109,634 | 145,422 | (73,252)
Cash and cash equivalents, beginning of year | 292,341 | 146,919 | 220,171
Cash and cash equivalents, end of year | 401,975 | 292,341 | 146,919
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for interest | 2 | 34 | 74
Cash paid during the year for income taxes, net of tax refunds | 24,332 | 13,346 | 5,529
Supplemental disclosure of noncash investing and financing activities: |  |  |
Assets acquired under capital lease obligations and other financing arrangements | $ 0 | $ 14 | $ 70

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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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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 for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + 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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- References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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