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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Business Acquisition [Line Items]              
GOODWILL $ 100,722   $ 55,831     $ 19,828  
Genesis              
Business Acquisition [Line Items]              
Cash and cash equivalents 2,847            
Assets acquired excluding cash and cash equivalents and deferred tax assets 39,262            
Liabilities assumed excluding deferred tax liabilities (23,506)            
Deferred tax liabilities, net 0            
Intangible assets 43,700            
Total identifiable net assets 62,303            
GOODWILL 45,236            
Total purchase price 107,539            
RC              
Business Acquisition [Line Items]              
Cash and cash equivalents   $ 30          
Assets acquired excluding cash and cash equivalents and deferred tax assets   2,151          
Liabilities assumed excluding deferred tax liabilities   (1,932)          
Deferred tax liabilities, net   (573)          
Intangible assets   705          
Total identifiable net assets   381          
GOODWILL   4,072          
Total purchase price   $ 4,453          
GmbH RC and Genesis              
Business Acquisition [Line Items]              
Cash and cash equivalents 2,877            
Assets acquired excluding cash and cash equivalents and deferred tax assets 41,413            
Liabilities assumed excluding deferred tax liabilities (25,438)            
Deferred tax liabilities, net (573)            
Intangible assets 44,405            
Total identifiable net assets 62,684            
GOODWILL 49,308            
Total purchase price $ 111,992            
LDD              
Business Acquisition [Line Items]              
Cash and cash equivalents     1,002        
Assets acquired excluding cash and cash equivalents and deferred tax assets     1,346        
Liabilities assumed excluding deferred tax liabilities     (708)        
Deferred tax liabilities, net     (538)        
Intangible assets     3,614        
Total identifiable net assets     4,716        
GOODWILL     5,276        
Total purchase price     9,992        
ILT              
Business Acquisition [Line Items]              
Cash and cash equivalents       $ 969      
Assets acquired excluding cash and cash equivalents and deferred tax assets       14,353      
Liabilities assumed excluding deferred tax liabilities       (11,669)      
Deferred tax liabilities, net       (2,004)      
Intangible assets       19,140      
Total identifiable net assets       20,789      
GOODWILL       19,467      
Total purchase price       $ 40,256      
OptiGrate              
Business Acquisition [Line Items]              
Cash and cash equivalents         $ 3,714    
Assets acquired excluding cash and cash equivalents and deferred tax assets         1,351    
Liabilities assumed excluding deferred tax liabilities         (687)    
Deferred tax liabilities, net         (2,068)    
Intangible assets         5,660    
Total identifiable net assets         7,970    
GOODWILL         8,900    
Total purchase price         $ 16,870    
LDD, ILT, And OptiGrate              
Business Acquisition [Line Items]              
Cash and cash equivalents     5,685        
Assets acquired excluding cash and cash equivalents and deferred tax assets     17,050        
Liabilities assumed excluding deferred tax liabilities     (13,064)        
Deferred tax liabilities, net     (4,610)        
Intangible assets     28,414        
Total identifiable net assets     33,475        
GOODWILL     33,643        
Total purchase price     $ 67,118        
BSI              
Business Acquisition [Line Items]              
Cash and cash equivalents           0  
Assets acquired excluding cash and cash equivalents and deferred tax assets           219  
Liabilities assumed excluding deferred tax liabilities           (133)  
Deferred tax liabilities, net           0  
Intangible assets           1,395  
Total identifiable net assets           1,481  
GOODWILL           0  
Total purchase price           1,481  
Menara              
Business Acquisition [Line Items]              
Cash and cash equivalents             $ 520
Assets acquired excluding cash and cash equivalents and deferred tax assets             9,585
Liabilities assumed excluding deferred tax liabilities             (1,876)
Deferred tax liabilities, net             (123)
Intangible assets             19,400
Total identifiable net assets             27,506
GOODWILL             19,325
Total purchase price             $ 46,831
BSI and Menara              
Business Acquisition [Line Items]              
Cash and cash equivalents           520  
Assets acquired excluding cash and cash equivalents and deferred tax assets           9,804  
Liabilities assumed excluding deferred tax liabilities           (2,009)  
Deferred tax liabilities, net           (123)  
Intangible assets           20,795  
Total identifiable net assets           28,987  
GOODWILL           19,325  
Total purchase price           $ 48,312