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Lease Obligations - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total $ 2,700    
Capital Lease Obligations, Current 1,119 $ 1,086  
Capital Lease Obligations 2,600 3,700  
Operating Leases, Rent Expense, Net 60,500 $ 44,600 $ 44,900
Capital Leases, Future Minimum Payments Due $ 2,735    
Capital Lease Future Minimum Payments Total Amortization Period 4 years 6 months    
Minimum [Member]      
Operating Lease, Lease Not yet adopted, Weighted Average Remaining Lease Term 1 year    
Maximum [Member]      
Operating Lease, Lease Not yet adopted, Weighted Average Remaining Lease Term 8 years