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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.