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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net income | $ 74,805 | $ 70,949 | $ 51,558
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 44,712 | 37,042 | 29,380
Impairment of software |  |  | 11,881
Deferred taxes | 13,801 | 16,378 | 24,501
Compensation expense related to share-based compensation plans | 8,479 | 7,833 | 8,258
Gain on sale of assets | (573) | (129) | (46)
Excess tax benefits from share based compensation | (733) | (81) |
Changes in operating assets and liabilities: |  |  |
Restricted investments | 231 | 836 | (1,190)
Accounts receivable, net | (87,629) | 36,373 | (28,621)
Prepaid taxes | 66 | 14,575 | (14,533)
Prepaid expenses and other current assets | 1,099 | (3,401) | (1,621)
Other assets | 570 | (805) | (2,047)
Accounts payable | 35,709 | (25,736) | 20,370
Accrued expenses | 9,238 | 20,505 | 367
Non-current liabilities | 2,698 | (2,642) | 284
Net cash provided by operating activities | 102,473 | 171,697 | 98,541
Cash flows from investing activities: |  |  |
Proceeds from sale of equipment | 2,061 | 2,309 | 612
Purchases of property and equipment | (107,409) | (83,042) | (119,171)
Net cash used in investing activities | (105,348) | (80,733) | (118,559)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 62,155 | 64,442 | 91,084
Repayments of long-term debt | (34,767) | (23,217) | (7,251)
Stock tendered for payments of withholding taxes | (2,489) | (2,916) | (3,195)
Purchase of treasury stock | (100,000) | (28,823) | (18,024)
Capital lease payments | (2,634) | (2,534) | (2,449)
Excess tax benefits from share-based compensation | 372 | 195 | 652
Net cash (used in) provided by financing activities | (77,363) | 7,147 | 60,817
Effect of exchange rate changes on cash and cash equivalents | (107) | (131) | 6
Net (decrease) increase in cash and cash equivalents | (80,345) | 97,980 | 40,805
Cash and cash equivalents beginning of the year | 207,749 | 109,769 | 68,964
Cash and cash equivalents end of the year | 127,404 | 207,749 | 109,769
Supplemental disclosures of cash paid for: |  |  |
Interest | 3,665 | 2,977 | 1,532
Income taxes | $ 33,233 | $ 6,990 | $ 20,189

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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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Period Type: | duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, 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 Reference 2: 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 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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