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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 20, 2011
Dec. 31, 2016
Dec. 31, 2015
Aug. 16, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 16,800 $ 17,400  
Available-for-sale securities, current portion   400 400  
Fair Value, Discount Amount, Available for sales securities   $ 3,100 3,200  
Payment to option holder, percentage of EBITDA   1.00%    
Contingent consideration, liability for payments to option holder, current   $ 900    
Contingent consideration, liability for payments to option holder, noncurrent   2,200 2,700  
Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, gross   21,000    
Investment available for sale   $ 17,259 $ 17,839  
Debt security, interest rate   7.50%    
Kansas Star        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Payment to option holder, percentage of EBITDA 1.00%      
Senior Notes | 8.375% Senior Notes due 2018 | Peninsula        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt instrument, stated interest rate     8.38% 8.375%