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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 - operating activities:      
Net income including noncontrolling interests $ 182,153 $ 172,507 $ 173,427
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 38,881 36,294 36,524
Amortization of identifiable intangible assets 40,908 37,895 37,966
Provision for doubtful accounts 6,194 2,853 2,918
Deferred income taxes (8,108) (10,300) 5,748
Loss on sale of subsidiary 0 0 608
Gain on sale of building 0 0 (11,749)
Gain on sale of property, plant and equipment (330) (248) (4,920)
Excess tax benefits from share-based compensation (2,546) (1,663) (8,264)
Equity income from unconsolidated entities (1,569) (2,883) (1,440)
Non-cash expense for amortization of debt issuance costs 1,354 1,307 1,307
Non-cash (income) expense from contingent consideration arrangements 0 (464) 606
Non-cash expense for impairment of identifiable intangible assets 2,428 0 1,471
Non-cash share-based compensation expense 8,902 8,801 8,121
Non-cash (income) expense from changes in unrecognized income tax benefits (759) (317) 2,143
Distributions from unconsolidated entities 1,247 3,352 1,767
Changes in operating assets and liabilities, excluding the effect of businesses acquired:      
(Increase) decrease in accounts receivable (98,773) (115,303) 27,409
Decrease in inventories 954 9,733 5,269
Increase in costs and estimated earnings in excess of billings on uncompleted contracts (7,851) (12,837) (13,010)
Increase (decrease) in accounts payable 13,141 25,440 (25,122)
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts 57,244 58,614 (11,868)
Increase in accrued payroll and benefits and other accrued expenses and liabilities 22,659 37,122 32,340
Changes in other assets and liabilities, net 8,432 16,763 (14,594)
Net cash provided by operating activities 264,561 266,666 246,657
Cash flows - investing activities:      
Payments for acquisitions of businesses, net of cash acquired (232,947) (28,195) 0
Proceeds from sale of subsidiary 0 0 1,108
Proceeds from sale of building 0 0 11,885
Proceeds from sale of property, plant and equipment 2,023 3,847 7,239
Purchase of property, plant and equipment (39,648) (35,460) (38,035)
Investments in and advances to unconsolidated entities and joint ventures (99) 0 (3,865)
Net cash used in investing activities (270,671) (59,808) (21,668)
Cash flows - financing activities:      
Proceeds from revolving credit facility 220,000 0 0
Repayments of revolving credit facility (95,000) 0 0
Borrowings from long-term debt 400,000 0 0
Repayments of long-term debt and debt issuance costs (417,990) (17,514) (17,454)
Repayments of capital lease obligations (1,384) (2,737) (1,715)
Dividends paid to stockholders (19,454) (20,095) (21,293)
Repurchase of common stock (94,221) (104,330) (201,994)
Proceeds from exercise of stock options 741 3,836 6,858
Payments to satisfy minimum tax withholding (4,225) (3,866) (1,481)
Issuance of common stock under employee stock purchase plan 4,814 4,223 3,615
Payments for contingent consideration arrangements 0 (403) 0
Distributions to noncontrolling interests (2,710) (10,250) (4,750)
Excess tax benefits from share-based compensation 0 1,663 8,264
Net cash used in financing activities (9,429) (149,473) (229,950)
Effect of exchange rate changes on cash and cash equivalents (6,675) (2,610) (2,796)
(Decrease) increase in cash and cash equivalents (22,214) 54,775 (7,757)
Cash and cash equivalents at beginning of year 486,831 432,056 439,813
Cash and cash equivalents at end of period $ 464,617 $ 486,831 $ 432,056