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Separate Financial Information of Guarantor Subsidiaries Condensed Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities $ 5,539 $ (11,109)
INVESTING ACTIVITIES    
Purchases of Property, Plant and Equipment (3,480) (4,673)
Proceeds from Disposals of Property, Plant and Equipment 16 53
Proceeds from Principal Payments Received on Long-Term Note Receivable 167 0
Issuance of Long-Term Note Receivable 0 (1,500)
Acquisition of Businesses, Net of Cash Acquired 0 (304)
Purchase of Intangible Assets (1,000) (2,500)
Change in Investments in Subsidiaries   0
Loan (Payments) Borrowings from Subsidiaries 0  
Net Cash Used in Investing Activities (4,297) (8,924)
FINANCING ACTIVITIES    
Loan Borrowings (Payments) from Parent 0  
Change in Subsidiary Equity   0
Proceeds from Issuance of Long-term Debt 0 20,000
Payments of Long-term Debt (4,037) (11,151)
Change in Capital Lease Obligations 81 0
Proceeds from Issuance of Common Stock 794 1,655
Dividends Paid (3,758) (3,722)
Net Cash (Used in) Provided by Financing Activities (6,920) 6,782
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 1,273 330
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash (4,405) (12,921)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 59,051 58,550
Cash, Cash Equivalents and Restricted Cash at End of Period 54,646 45,629
Eliminations    
OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 0 0
INVESTING ACTIVITIES    
Purchases of Property, Plant and Equipment 0 0
Proceeds from Disposals of Property, Plant and Equipment 0 0
Proceeds from Principal Payments Received on Long-Term Note Receivable 0  
Issuance of Long-Term Note Receivable   0
Acquisition of Businesses, Net of Cash Acquired   0
Purchase of Intangible Assets 0 0
Change in Investments in Subsidiaries   3,500
Loan (Payments) Borrowings from Subsidiaries 1,294  
Net Cash Used in Investing Activities 1,294 (3,500)
FINANCING ACTIVITIES    
Loan Borrowings (Payments) from Parent (1,294)  
Change in Subsidiary Equity   (3,500)
Proceeds from Issuance of Long-term Debt   0
Payments of Long-term Debt 0 0
Change in Capital Lease Obligations 0  
Proceeds from Issuance of Common Stock 0 0
Dividends Paid 0 0
Net Cash (Used in) Provided by Financing Activities (1,294) (3,500)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 0 0
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash 0 0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 0 0
Cash, Cash Equivalents and Restricted Cash at End of Period 0 0
Parent    
OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 5,815 (14,063)
INVESTING ACTIVITIES    
Purchases of Property, Plant and Equipment (342) (1,188)
Proceeds from Disposals of Property, Plant and Equipment 11 6
Proceeds from Principal Payments Received on Long-Term Note Receivable 0  
Issuance of Long-Term Note Receivable   0
Acquisition of Businesses, Net of Cash Acquired   (304)
Purchase of Intangible Assets (1,000) (2,500)
Change in Investments in Subsidiaries   (3,500)
Loan (Payments) Borrowings from Subsidiaries (1,294)  
Net Cash Used in Investing Activities (2,625) (7,486)
FINANCING ACTIVITIES    
Loan Borrowings (Payments) from Parent 0  
Change in Subsidiary Equity   0
Proceeds from Issuance of Long-term Debt   20,000
Payments of Long-term Debt (4,000) (11,143)
Change in Capital Lease Obligations 0  
Proceeds from Issuance of Common Stock 794 1,655
Dividends Paid (3,758) (3,722)
Net Cash (Used in) Provided by Financing Activities (6,964) 6,790
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 72 (102)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash (3,702) (14,861)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 18,469 38,484
Cash, Cash Equivalents and Restricted Cash at End of Period 14,767 23,623
Guarantor Subsidiaries    
OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 1,800 438
INVESTING ACTIVITIES    
Purchases of Property, Plant and Equipment (229) 0
Proceeds from Disposals of Property, Plant and Equipment 0 0
Proceeds from Principal Payments Received on Long-Term Note Receivable 0  
Issuance of Long-Term Note Receivable   0
Acquisition of Businesses, Net of Cash Acquired   0
Purchase of Intangible Assets 0 0
Change in Investments in Subsidiaries   0
Loan (Payments) Borrowings from Subsidiaries 0  
Net Cash Used in Investing Activities (229) 0
FINANCING ACTIVITIES    
Loan Borrowings (Payments) from Parent 0  
Change in Subsidiary Equity   0
Proceeds from Issuance of Long-term Debt   0
Payments of Long-term Debt 0 0
Change in Capital Lease Obligations 0  
Proceeds from Issuance of Common Stock 0 0
Dividends Paid 0 0
Net Cash (Used in) Provided by Financing Activities 0 0
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 0 0
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash 1,571 438
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 507 226
Cash, Cash Equivalents and Restricted Cash at End of Period 2,078 664
Non-Guarantor Subsidiaries    
OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities (2,076) 2,516
INVESTING ACTIVITIES    
Purchases of Property, Plant and Equipment (2,909) (3,485)
Proceeds from Disposals of Property, Plant and Equipment 5 47
Proceeds from Principal Payments Received on Long-Term Note Receivable 167  
Issuance of Long-Term Note Receivable   (1,500)
Acquisition of Businesses, Net of Cash Acquired   0
Purchase of Intangible Assets 0 0
Change in Investments in Subsidiaries   0
Loan (Payments) Borrowings from Subsidiaries 0  
Net Cash Used in Investing Activities (2,737) (4,938)
FINANCING ACTIVITIES    
Loan Borrowings (Payments) from Parent 1,294  
Change in Subsidiary Equity   3,500
Proceeds from Issuance of Long-term Debt   0
Payments of Long-term Debt (37) (8)
Change in Capital Lease Obligations 81  
Proceeds from Issuance of Common Stock 0 0
Dividends Paid 0 0
Net Cash (Used in) Provided by Financing Activities 1,338 3,492
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 1,201 432
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash (2,274) 1,502
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 40,075 19,840
Cash, Cash Equivalents and Restricted Cash at End of Period $ 37,801 $ 21,342