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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pro-Rata Distributions [Line Items]      
Lease term 16 years    
Lease expense for property and equipment $ 1,988 $ 1,856 $ 1,724
Possible losses from legal dispute, minimum 0    
Possible losses from legal dispute, maximum 1,500    
Distributions to non-controlling interests $ 407    
Fiscal year 2016      
Pro-Rata Distributions [Line Items]      
Pro-rata distributions, percentage of free-cash-flow 50.00%    
Fiscal year 2015      
Pro-Rata Distributions [Line Items]      
Pro-rata distributions, percentage of free-cash-flow 100.00%    
DMV      
Pro-Rata Distributions [Line Items]      
Distributions to non-controlling interests $ 264