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Fair Value Measurements (Balances Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 203,104 $ 193,862 $ 158,821 $ 145,341
Restricted cash 24,175 16,488    
Investment available for sale 17,300 16,800    
Fair Value, Measurements, Recurring        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent payments 2,887 3,038    
Cash and cash equivalents 203,104 193,862    
Restricted cash 24,175 16,488    
Investment available for sale 17,752 17,259    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent payments 0 0    
Cash and cash equivalents 203,104 193,862    
Restricted cash   16,488    
Investment available for sale 0 0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent payments 0 0    
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 0 0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent payments 2,887 3,038    
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 17,752 17,259    
Parent Company [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 347 $ 1,212 $ 2 $ 2