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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows - operating activities: |  |  |  |
Net income including noncontrolling interests |  | $ 132,943 | $ 325,140 | $ 283,577
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 46,721 | 43,945 | 38,472
Amortization of identifiable intangible assets |  | 59,950 | 48,142 | 42,443
Provision for credit losses |  | 3,269 | 2,628 | 2,123
Deferred income taxes |  | (36,354) | 1,701 | 4,249
Gain on sale or disposal of property, plant and equipment |  | (122) | (3,981) | (517)
Excess tax benefits from share-based compensation |  | (191) | (984) | (1,646)
Equity (income) loss from unconsolidated entities |  | (14) | 2,990 | (347)
Non-cash expense for amortization of debt issuance costs |  | 998 | 1,186 | 1,186
Non-cash expense from contingent consideration arrangements |  | 649 | 1,373 | 186
Non-cash expense for impairment of goodwill, identifiable intangible assets, and other long- lived assets |  | 232,750 | 0 | 907
Non-cash share-based compensation expense |  | 11,151 | 11,386 | 11,030
Non-cash income from changes in unrecognized tax benefits |  | 0 | 0 | (72)
Distributions from unconsolidated entities |  | 0 | 1,074 | 3,110
Changes in operating assets and liabilities, excluding the effect of businesses acquired: |  |  |  |
Decrease (increase) in accounts receivable |  | 139,377 | (135,954) | (146,101)
(Increase) decrease in inventories |  | (12,709) | 4,345 | (3,915)
Decrease (increase) in contract assets |  | 7,829 | (10,111) | (30,935)
(Decrease) increase in accounts payable |  | (9,022) | (33,971) | 78,554
Increase in contract liabilities |  | 85,142 | 51,310 | 20,726
Increase (decrease) in accrued payroll and benefits and other accrued expenses and liabilities |  | 113,835 | 49,551 | (24,715)
Changes in other assets and liabilities, net |  | 30,164 | (4,070) | (7,304)
Net cash provided by operating activities |  | 806,366 | 355,700 | 271,011
Cash flows - investing activities: |  |  |  |
Payments for acquisitions of businesses, net of cash acquired |  | (50,357) | (300,980) | (72,080)
Proceeds from sale or disposal of property, plant and equipment |  | 3,463 | 5,487 | 1,237
Purchases of property, plant and equipment |  | (47,969) | (48,432) | (43,479)
Investments in and advances to unconsolidated entities |  | 0 | (2,252) | (3,484)
Distributions from unconsolidated entities |  | 0 | 838 | 84
Net cash used in investing activities |  | (94,863) | (345,339) | (117,722)
Cash flows - financing activities: |  |  |  |
Proceeds from revolving credit facility |  | 200,000 | 50,000 | 0
Repayments of revolving credit facility |  | (250,000) | (25,000) | 0
Proceeds from long-term debt |  | 300,000 | 0 | 0
Repayments of long-term debt and debt issuance costs |  | (286,987) | (15,198) | (15,235)
Repayments of finance lease liabilities |  | (4,470) | (4,571) | (1,501)
Dividends paid to stockholders |  | (17,674) | (17,950) | (18,640)
Repurchases of common stock |  | (112,553) | 0 | (216,244)
Taxes paid related to net share settlements of equity awards |  | (2,640) | (6,451) | (3,848)
Issuances of common stock under employee stock purchase plan |  | 6,557 | 6,090 | 5,765
Payments for contingent consideration arrangements |  | (4,070) | (5,917) | (3,339)
Distributions to noncontrolling interests |  | (70) | (250) | 0
Net cash used in financing activities |  | (171,907) | (19,247) | (253,042)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash |  | 4,046 | 2,592 | (3,421)
Increase (decrease) in cash, cash equivalents, and restricted cash |  | 543,642 | (6,294) | (103,174)
Cash, cash equivalents, and restricted cash at beginning of year (1) | [1] | 359,920 | 366,214 | 469,388
Cash, cash equivalents, and restricted cash at end of period (1) | [1] | $ 903,562 | $ 359,920 | $ 366,214
[1] | Includes $0.7 million, $1.1 million, $2.3 million, and $2.0 million of restricted cash classified as “Prepaid expenses and other” in the Consolidated Balance Sheets as of December 31, 2020, 2019, 2018, and 2017, 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=121586364&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=121586364&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=121586364&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=121586364&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=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests. + 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=121586364&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=121586364&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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + 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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + 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=121586364&loc=d3e3179-108585 + Details
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