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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Current   $ 500    
Assets        
Restricted cash $ 25,794 24,175 $ 22,047 $ 16,488
Investment available for sale 16,000 17,300    
Liabilities        
Fair Value, Discount Amount, Available for sales securities 2,900 2,900    
Fair Value, Measurements, Recurring [Member]        
Assets        
Cash and cash equivalents 179,706 203,104    
Restricted cash 25,794 24,175    
Investment available for sale 16,454 17,752   $ 20,500
Liabilities        
Business Combination, Contingent Consideration, Liability 2,813 2,887    
Fair Value, Measurements, Recurring [Member] | Level 1        
Assets        
Cash and cash equivalents 179,706 203,104    
Investment available for sale 0 0    
Liabilities        
Business Combination, Contingent Consideration, Liability 0 0    
Fair Value, Measurements, Recurring [Member] | Level 2        
Assets        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 0 0    
Liabilities        
Business Combination, Contingent Consideration, Liability 0 0    
Fair Value, Measurements, Recurring [Member] | Level 3        
Assets        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 16,454 17,752    
Liabilities        
Business Combination, Contingent Consideration, Liability 2,813 $ 2,887    
Peninsula Gaming [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Current $ 500