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(Narratives)(Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]      
Valuation allowance $ 1,200 $ 1,000  
Accumulated net earning $ 315,573 $ 249,567  
U.S. federal statutory tax rate 35.00% 35.00% 35.00%
Gross deferred tax assets $ 34,400 $ 29,200  
Gross deferred tax liabilities 107,500 $ 89,700  
Internal Revenue Service (IRS) [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 0    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 0    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 5,800    
Accumulated net earning 16,300    
Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 800    
Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 1,300