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Lease Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Lease Obligations [Abstract]      
Lease Expiration Date Jan. 04, 2034    
Rent expense $ 5,800 $ 9,500 $ 7,400
2016 minimum rental payment 8,468    
2017 minimum rental payment 6,452    
2018 minimum rental payment 5,170    
2019 minimum rental payment 4,161    
2020 minimum rental payment 3,685    
Minimum rental payment thereafter 35,185    
Total minimum rental payment $ 63,121