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Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Weighted average remaining lease term for operating leases 4 years 1 month 6 days  
Weighted average discount rate for operating leases 4.80%  
Components of Lease Expense [Abstract]    
Operating lease cost $ 12,861  
Short-term lease cost 52  
Variable lease cost 1,052  
Total lease expense 13,965  
Operating right-of-use assets 117,329 $ 0
Current operating lease liabilities 38,900  
Long-term operating lease liabilities 81,075 0
Supplemental Cash Flow Information Related to Leases [Abstract]    
Operating cash outflow from operating leases 14,377  
ROU assets obtained in exchange for lease obligations 128,704  
Maturities of Operating Lease Liabilities [Abstract]    
2019 43,686  
2020 33,522  
2021 23,544  
2022 13,187  
2023 8,542  
Thereafter 10,398  
Total 132,879  
Less: Finance charges 12,899  
Total principal liability 119,980  
Additional lease liabilities not yet commenced $ 2,600  
Operating Leases, Minimum Future Obligations [Abstract]    
2019   39,358
2020   27,553
2021   20,266
2022   11,723
2023   9,950
Thereafter   7,628
Total minimum lease payments   116,478
Financing Obligations, Minimum Future Obligations [Abstract]    
2019   726
2020   748
2021   757
2022   770
2023   794
Thereafter   1,148
Total minimum lease payments   $ 4,943
Minimum [Member]    
Leases [Abstract]    
Remaining lease terms 1 year  
Maximum [Member]    
Leases [Abstract]    
Remaining lease terms 15 years  
Extension period for leases 10 years  
Termination period for leases 1 year