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Leases (Schedule of Maturity of Lease Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating Leases    
April 1, 2019 to March 31, 2020 $ 57,807  
April 1, 2020 to March 31, 2021 47,957  
April 1, 2021 to March 31, 2022 39,428  
April 1, 2022 to March 31, 2023 31,913  
April 1, 2023 to March 31, 2024 25,016  
Thereafter 75,741  
Total minimum lease payments 277,862  
Less: Amount of lease payments representing interest (37,860)  
Present value of future minimum lease payments 240,002  
Current portion of lease liabilities 48,776 $ 0
Noncurrent portion of lease liabilities 191,226 0
Finance Leases    
April 1, 2019 to March 31, 2020 4,879  
April 1, 2020 to March 31, 2021 3,256  
April 1, 2021 to March 31, 2022 2,020  
April 1, 2022 to March 31, 2023 1,014  
April 1, 2023 to March 31, 2024 279  
Thereafter 172  
Total minimum lease payments 11,620  
Less: Amount of lease payments representing interest (710)  
Present value of future minimum lease payments [1] 10,910 $ 4,213
Current portion of lease liabilities 4,524  
Noncurrent portion of lease liabilities $ 6,386  
[1] See Note 14 - Leases for further disclosure regarding finance lease obligations.