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Commitments and Contingencies - Future Lease Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
2016 $ 31,243    
2017 23,116    
2018 19,579    
2019 16,929    
2020 15,446    
Thereafter 132,396    
Total Lease Commitments 238,709    
Operating Leases, Rent Expense, Net $ 97,000 $ 205,000 $ 229,000