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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2015
Principles of Consolidation                
Lag period for including results of European subsidiaries in consolidated financial statements     1 month          
Cash and Cash Equivalents                
Maximum term of original maturity to classify instruments as cash and cash equivalents     3 months          
Research and Development Costs                
Research and development expenses     $ 20,100 $ 19,200 $ 21,700      
Income Taxes                
Estimated benefit as a result of the new legislation $ 1,700 $ 26,600 1,700          
New Accounting Pronouncements                
Selling, general, and administrative expenses     (363,717) (315,586) (315,468)      
Accumulated other comprehensive income 68,394 43,774 68,394 43,774 43,403     $ 37,318
Retained earnings $ 395,434 347,304 $ 395,434 347,304        
ASU 2018-02                
New Accounting Pronouncements                
Accumulated other comprehensive income             $ (4,800)  
Retained earnings   $ 4,800   4,800        
ASU 2017-07                
New Accounting Pronouncements                
Selling, general, and administrative expenses       9,600 5,800      
Other Income, net       $ 9,600 $ 5,800      
Buildings | Minimum                
Property, Plant, Equipment and Depreciation                
Useful life     45 years          
Buildings | Maximum                
Property, Plant, Equipment and Depreciation                
Useful life     60 years          
Building improvements | Minimum                
Property, Plant, Equipment and Depreciation                
Useful life     10 years          
Building improvements | Maximum                
Property, Plant, Equipment and Depreciation                
Useful life     20 years          
Office equipment | Minimum                
Property, Plant, Equipment and Depreciation                
Useful life     3 years          
Office equipment | Maximum                
Property, Plant, Equipment and Depreciation                
Useful life     10 years          
Software | Minimum                
Property, Plant, Equipment and Depreciation                
Useful life     4 years          
Software | Maximum                
Property, Plant, Equipment and Depreciation                
Useful life     12 years          
Machinery and equipment | Minimum                
Property, Plant, Equipment and Depreciation                
Useful life     3 years          
Machinery and equipment | Maximum                
Property, Plant, Equipment and Depreciation                
Useful life     10 years          
Scenario, Forecast | ASU 2016-02                
New Accounting Pronouncements                
Net lease liabilities           $ 133,000    
Lease, right-of-use asset           $ 120,000