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Commitments and Contingencies (Lease Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Total lease payments $ 23,700 $ 24,100 $ 25,000
Operating Leases, Future Minimum Payments Due [Abstract]      
2016 2,537    
2017 2,574    
2018 2,537    
2019 2,431    
2020 0    
2021 and thereafter $ 0