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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |  |
Net income | $ 84,734 | $ 39,755 | $ 10,812
Adjustment to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 69,086 | 69,179 | 64,507
Amortization of contract acquisition costs | 1,002 | 3,015 | 1,678
Amortization of debt issuance costs | 1,083 | 992 | 745
Imputed interest expense and fair value adjustments to contingent consideration | 2,339 | 10,217 | 51
Provision for doubtful accounts | 1,711 | 3,679 | 458
(Gain) loss on disposal of assets | 189 | 111 | 3,694
Gain on sale of business | 0 | 0 | (908)
Impairment losses | 3,735 | 1,452 | 5,322
Impairment of equity investment | 0 | 15,632 | 0
Gain (adjustment) on bargain purchase of a business | 0 | (685) | 0
Non-cash loss on assets held for sale reclassified to assets held and used | 0 | 1,616 | 0
Deferred income taxes | (1,376) | (7,975) | 16,777
Excess tax benefit from equity-based awards | (1,231) | (635) | (2,192)
Equity-based compensation expense | 12,814 | 12,145 | 11,852
(Gain) loss on foreign currency derivatives | (140) | 1,524 | (681)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | 29,608 | 29,985 | (59,284)
Prepaids and other assets | 27,413 | (30,438) | (19,266)
Accounts payable and accrued expenses | 97,268 | 11,713 | 18,968
Deferred revenue and other liabilities | (90,246) | 7,063 | 60,619
Net cash provided by operating activities | 237,989 | 168,345 | 113,152
Cash flows from investing activities |  |  |
Proceeds from sale of long-live assets | 382 | 34 | 39
Purchases of property, plant and equipment | (60,776) | (43,450) | (51,958)
Proceeds from sale of business | 0 | 0 | 636
Investments in non-marketable equity investments | 0 | (2,119) | (1,384)
Acquisitions, net of cash acquired of $4,547, $4,530, and $5,997, respectively | (102,457) | (2,027) | (116,320)
Net cash used in investing activities | (162,851) | (47,562) | (168,987)
Cash flows from financing activities |  |  |
Proceeds from line of credit | 1,152,750 | 2,162,400 | 2,293,587
Payments on line of credit | (1,144,750) | (2,224,400) | (2,166,887)
Payments on other debt | (11,855) | (5,989) | (6,041)
Payments of contingent consideration and hold back payments to acquisitions | (5,902) | (1,349) | (1,409)
Dividends paid to shareholders | (28,739) | (25,346) | (21,531)
Payments to noncontrolling interest | (4,950) | (2,925) | (3,645)
Capital contribution from noncontrolling interest | 3,362 | 0 | 0
Proceeds from exercise of stock options | 0 | 208 | 2,150
Tax payments related to issuance of restricted stock units | (5,471) | (4,643) | (5,397)
Payments of debt issuance costs | (1,819) | (35) | (918)
Purchase of treasury stock | 0 | 0 | (18,328)
Net cash (used in) provided by financing activities | (47,374) | (102,079) | 71,581
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (410) | (14,904) | 3,427
Increase (decrease) in cash, cash equivalents and restricted cash | 27,354 | 3,800 | 19,173
Cash, cash equivalents and restricted cash, beginning of period | 78,237 | 74,437 | 55,264
Cash, cash equivalents and restricted cash, end of period | 105,591 | 78,237 | 74,437
Supplemental disclosures |  |  |
Cash paid for interest | 13,108 | 17,456 | 11,727
Cash paid for income taxes | 36,316 | 39,984 | 18,813
Non-cash investing and financing activities |  |  |
Acquisition of long lived assets through finance leases | 3,731 | 15,018 | 9,836
Acquisition of equipment through increase in accounts payable, net | $ 881 | $ 339 | $ 97

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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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