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Separate Financial Information of Guarantor Subsidiaries Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net Cash Provided by Operating Activities $ 54,174 $ 57,878 $ 45,232
INVESTING ACTIVITIES      
Purchases of Property, Plant and Equipment (20,437) (26,526) (24,780)
Proceeds from Disposals of Property, Plant and Equipment 2,511 615 336
Proceeds from Sale of Business 0 285 1,185
Proceeds from Principal Payments Received on Long-Term Note Receivable 667    
Acquisitions of Businesses, Net of Cash Acquired (354,073) (12,933) 0
Purchase of Intangible Asset (2,500) 0 0
Change in Investments in Subsidiaries 0    
Issuance of Long-Term Note Receivable   (2,000)  
Purchase of Intangible Asset (1,500)    
Change in Investments in Subsidiaries   0  
Loan Borrowings (Payments) from Subsidiaries 0 0 0
(Increase) Decrease in Restricted Cash (92) 116 (322)
Net Cash Used in Investing Activities (375,424) (40,443) (23,581)
FINANCING ACTIVITIES      
Loan Borrowings (Payments) from Parent 0 0  
Proceeds from Short-Term Debt 303,000 0 0
Repayments of Short-Term Debt (303,000) 0 0
Payments of Long-Term Debt (96,248) (3,460) (3,445)
Purchases of Common Stock 0 (12,762) (45,998)
Change in Subsidiary Equity 0 0  
Proceeds from Issuance of Long-Term Debt 440,000 15,000 0
Payments of Long-Term Debt (96,248) (3,460)  
Payments of Debt Issuance Costs 16,482 0 0
Change in Capital Lease Obligations 311    
Proceeds from Issuances of Common Stock 6,875 5,271 1,677
Purchase of Noncontrolling Owner Interest (30) 0 0
Excess Tax Benefit on Stock Plans 0 686 859
Dividends Paid (14,953) (14,293) (14,498)
Net Cash Provided by Financing Activities 319,473 (9,558) (61,405)
Effect of Exchange Rate Changes on Cash and Cash Equivalents 2,142 (1,144) (1,908)
NET INCREASE IN CASH AND CASH EQUIVALENTS 365 6,733 (41,662)
Cash and Cash Equivalents at Beginning of Year 58,033 51,300 92,962
CASH AND CASH EQUIVALENTS AT END OF YEAR 58,398 58,033 51,300
Parent Company      
OPERATING ACTIVITIES      
Net Cash Provided by Operating Activities 26,992 44,147 40,764
INVESTING ACTIVITIES      
Purchases of Property, Plant and Equipment (9,558) (21,507) (19,149)
Proceeds from Disposals of Property, Plant and Equipment 23 377 32
Proceeds from Sale of Business   0 0
Proceeds from Principal Payments Received on Long-Term Note Receivable 0    
Acquisitions of Businesses, Net of Cash Acquired (304) 0  
Purchase of Intangible Asset (2,500)    
Change in Investments in Subsidiaries (199,028)    
Issuance of Long-Term Note Receivable   0  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries   (19,594)  
Loan Borrowings (Payments) from Subsidiaries (159,780) 8,690 268
(Increase) Decrease in Restricted Cash 0 0 0
Net Cash Used in Investing Activities (371,147) (32,034) (18,849)
FINANCING ACTIVITIES      
Loan Borrowings (Payments) from Parent 4,983 0  
Proceeds from Short-Term Debt 303,000    
Repayments of Short-Term Debt (303,000)   0
Payments of Long-Term Debt     (3,435)
Purchases of Common Stock   (12,762) (45,998)
Change in Subsidiary Equity 0 0  
Proceeds from Issuance of Long-Term Debt 440,000 15,000  
Payments of Long-Term Debt (96,142) (3,429)  
Payments of Debt Issuance Costs 16,482    
Change in Capital Lease Obligations 0    
Proceeds from Issuances of Common Stock 6,875 5,271 1,677
Purchase of Noncontrolling Owner Interest 0    
Excess Tax Benefit on Stock Plans   686 859
Dividends Paid (14,953) (14,293) (14,498)
Net Cash Provided by Financing Activities 324,281 (9,527) (61,395)
Effect of Exchange Rate Changes on Cash and Cash Equivalents (141) 64 79
NET INCREASE IN CASH AND CASH EQUIVALENTS (20,015) 2,650 (39,401)
Cash and Cash Equivalents at Beginning of Year 38,484 35,834 75,235
CASH AND CASH EQUIVALENTS AT END OF YEAR 18,469 38,484 35,834
Guarantor Subsidiaries      
OPERATING ACTIVITIES      
Net Cash Provided by Operating Activities 280 239 0
INVESTING ACTIVITIES      
Purchases of Property, Plant and Equipment 0 (13) 0
Proceeds from Disposals of Property, Plant and Equipment 1 0 0
Proceeds from Sale of Business   0 0
Proceeds from Principal Payments Received on Long-Term Note Receivable 0    
Acquisitions of Businesses, Net of Cash Acquired 0 (11,539)  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries 0    
Issuance of Long-Term Note Receivable   0  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries   0  
Loan Borrowings (Payments) from Subsidiaries 0 0 0
(Increase) Decrease in Restricted Cash 0 0 0
Net Cash Used in Investing Activities 1 (11,552) 0
FINANCING ACTIVITIES      
Loan Borrowings (Payments) from Parent 0 7,969  
Proceeds from Short-Term Debt 0    
Repayments of Short-Term Debt 0   0
Payments of Long-Term Debt     0
Purchases of Common Stock   0 0
Change in Subsidiary Equity 0 3,570  
Proceeds from Issuance of Long-Term Debt 0 0  
Payments of Long-Term Debt 0 0  
Payments of Debt Issuance Costs 0    
Change in Capital Lease Obligations 0    
Proceeds from Issuances of Common Stock 0 0 0
Purchase of Noncontrolling Owner Interest 0    
Excess Tax Benefit on Stock Plans   0 0
Dividends Paid 0 0 0
Net Cash Provided by Financing Activities 0 11,539 0
Effect of Exchange Rate Changes on Cash and Cash Equivalents 0 0 0
NET INCREASE IN CASH AND CASH EQUIVALENTS 281 226 0
Cash and Cash Equivalents at Beginning of Year 226 0 0
CASH AND CASH EQUIVALENTS AT END OF YEAR 507 226 0
Non-Guarantor Subsidiaries      
OPERATING ACTIVITIES      
Net Cash Provided by Operating Activities 27,711 14,090 4,928
INVESTING ACTIVITIES      
Purchases of Property, Plant and Equipment (10,879) (5,006) (5,631)
Proceeds from Disposals of Property, Plant and Equipment 2,487 238 304
Proceeds from Sale of Business   285 1,185
Proceeds from Principal Payments Received on Long-Term Note Receivable 667    
Acquisitions of Businesses, Net of Cash Acquired (353,769) (1,394)  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries 0    
Issuance of Long-Term Note Receivable   (2,000)  
Purchase of Intangible Asset (1,500)    
Change in Investments in Subsidiaries   0  
Loan Borrowings (Payments) from Subsidiaries (4,983) 0 0
(Increase) Decrease in Restricted Cash (92) 116 (322)
Net Cash Used in Investing Activities (368,069) (7,761) (4,464)
FINANCING ACTIVITIES      
Loan Borrowings (Payments) from Parent 159,780 (16,659)  
Proceeds from Short-Term Debt 0    
Repayments of Short-Term Debt 0   (268)
Payments of Long-Term Debt     (10)
Purchases of Common Stock   0 0
Change in Subsidiary Equity 199,028 16,024  
Proceeds from Issuance of Long-Term Debt 0 0  
Payments of Long-Term Debt (106) (31)  
Payments of Debt Issuance Costs 0    
Change in Capital Lease Obligations 311    
Proceeds from Issuances of Common Stock 0 0 0
Purchase of Noncontrolling Owner Interest (30)    
Excess Tax Benefit on Stock Plans   0 0
Dividends Paid (809) (598) (460)
Net Cash Provided by Financing Activities 358,174 (1,264) (738)
Effect of Exchange Rate Changes on Cash and Cash Equivalents 2,283 (1,208) (1,987)
NET INCREASE IN CASH AND CASH EQUIVALENTS 20,099 3,857 (2,261)
Cash and Cash Equivalents at Beginning of Year 19,323 15,466 17,727
CASH AND CASH EQUIVALENTS AT END OF YEAR 39,422 19,323 15,466
Consolidation, Eliminations      
OPERATING ACTIVITIES      
Net Cash Provided by Operating Activities (809) (598) (460)
INVESTING ACTIVITIES      
Purchases of Property, Plant and Equipment 0 0 0
Proceeds from Disposals of Property, Plant and Equipment 0 0 0
Proceeds from Sale of Business   0 0
Proceeds from Principal Payments Received on Long-Term Note Receivable 0    
Acquisitions of Businesses, Net of Cash Acquired 0 0  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries 199,028    
Issuance of Long-Term Note Receivable   0  
Purchase of Intangible Asset 0    
Change in Investments in Subsidiaries   19,594  
Loan Borrowings (Payments) from Subsidiaries 164,763 (8,690) (268)
(Increase) Decrease in Restricted Cash 0 0 0
Net Cash Used in Investing Activities 363,791 10,904 (268)
FINANCING ACTIVITIES      
Loan Borrowings (Payments) from Parent (164,763) 8,690  
Proceeds from Short-Term Debt 0    
Repayments of Short-Term Debt 0   268
Payments of Long-Term Debt     0
Purchases of Common Stock   0 0
Change in Subsidiary Equity (199,028) (19,594)  
Proceeds from Issuance of Long-Term Debt 0 0  
Payments of Long-Term Debt 0 0  
Payments of Debt Issuance Costs 0    
Change in Capital Lease Obligations 0    
Proceeds from Issuances of Common Stock 0 0 0
Purchase of Noncontrolling Owner Interest 0    
Excess Tax Benefit on Stock Plans   0 0
Dividends Paid 809 598 460
Net Cash Provided by Financing Activities (362,982) (10,306) 728
Effect of Exchange Rate Changes on Cash and Cash Equivalents 0 0 0
NET INCREASE IN CASH AND CASH EQUIVALENTS 0 0 0
Cash and Cash Equivalents at Beginning of Year 0 0 0
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 0 $ 0 $ 0