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Commitments and Contingencies (Commitments Under Noncancelable Lease Agreements) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 6,314
2020 4,603
2021 3,358
2022 2,596
2023 2,078
Thereafter 11,340
Total 30,289
Facilities and Land  
Operating Leased Assets [Line Items]  
2019 5,323
2020 3,945
2021 2,989
2022 2,493
2023 2,077
Thereafter 11,340
Total 28,167
Equipment and Automobiles  
Operating Leased Assets [Line Items]  
2019 991
2020 658
2021 369
2022 103
2023 1
Thereafter 0
Total $ 2,122