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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 - operating activities: |  |  |  |
Net income including noncontrolling interests |  | $ 325,140 | $ 283,577 | $ 227,193
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 43,945 | 38,472 | 39,915
Amortization of identifiable intangible assets |  | 48,142 | 42,443 | 48,594
Provision for doubtful accounts |  | 2,628 | 2,123 | 7,264
Deferred income taxes |  | 1,701 | 4,249 | (53,358)
Gain on sale or disposal of property, plant and equipment |  | (3,981) | (517) | (1,846)
Excess tax benefits from share-based compensation |  | (984) | (1,646) | (1,616)
Equity loss (income) from unconsolidated entities |  | 2,990 | (347) | (864)
Non-cash expense for amortization of debt issuance costs |  | 1,186 | 1,186 | 1,186
Non-cash expense from contingent consideration arrangements |  | 1,373 | 186 | 317
Non-cash expense for impairment of goodwill and identifiable intangible assets |  | 0 | 907 | 57,819
Non-cash share-based compensation expense |  | 11,386 | 11,030 | 9,939
Non-cash income from changes in unrecognized tax benefits |  | 0 | (72) | (5,641)
Distributions from unconsolidated entities |  | 1,074 | 3,110 | 5,506
Changes in operating assets and liabilities, excluding the effect of businesses acquired: |  |  |  |
Increase in accounts receivable |  | (135,954) | (146,101) | (80,514)
Decrease (increase) in inventories |  | 4,345 | (3,915) | (4,936)
(Increase) decrease in contract assets |  | (10,111) | (30,935) | 12,433
(Decrease) increase in accounts payable |  | (33,971) | 78,554 | 54,910
Increase in contract liabilities |  | 51,310 | 20,726 | 24,695
Increase (decrease) in accrued payroll and benefits and other accrued expenses and liabilities |  | 49,551 | (24,715) | 24,017
Changes in other assets and liabilities, net |  | (4,070) | (7,304) | 1,036
Net cash provided by operating activities |  | 355,700 | 271,011 | 366,049
Cash flows - investing activities: |  |  |  |
Payments for acquisitions of businesses, net of cash acquired |  | (300,980) | (72,080) | (107,223)
Proceeds from sale or disposal of property, plant and equipment |  | 5,487 | 1,237 | 4,014
Purchase of property, plant and equipment |  | (48,432) | (43,479) | (34,684)
Investments in and advances to unconsolidated entities |  | (2,252) | (3,484) | (675)
Distributions from unconsolidated entities |  | 838 | 84 | 475
Net cash used in investing activities |  | (345,339) | (117,722) | (138,093)
Cash flows - financing activities: |  |  |  |
Proceeds from revolving credit facility |  | 50,000 | 0 | 0
Repayments of revolving credit facility |  | (25,000) | 0 | (100,000)
Repayments of long-term debt |  | (15,198) | (15,235) | (15,202)
Repayments of finance lease liabilities |  | (4,571) | (1,501) | (1,445)
Dividends paid to stockholders |  | (17,950) | (18,640) | (18,971)
Repurchase of common stock |  | 0 | (216,244) | (93,166)
Taxes paid related to net share settlements of equity awards |  | (6,451) | (3,848) | (3,462)
Issuance of common stock under employee stock purchase plan |  | 6,090 | 5,765 | 4,793
Payments for contingent consideration arrangements |  | (5,917) | (3,339) | (1,017)
Distributions to noncontrolling interests |  | (250) | 0 | 0
Net cash used in financing activities |  | (19,247) | (253,042) | (228,470)
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 2,592 | (3,421) | 3,242
(Decrease) increase in cash, cash equivalents and restricted cash |  | (6,294) | (103,174) | 2,728
Cash, cash equivalents and restricted cash at beginning of year (1) | [1] | 366,214 | 469,388 | 466,660
Cash, cash equivalents and restricted cash at end of period (1) | [1] | $ 359,920 | $ 366,214 | $ 469,388
[1] | Includes $1.1 million, $2.3 million, $2.0 million and $2.0 million of restricted cash classified as “Prepaid expenses and other” in the Consolidated Balance Sheet as of December 31, 2019, 2018, 2017 and 2016, respectively.

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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 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 inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + 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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