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Leases (Schedule of Maturity of Lease Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating Leases    
July 1, 2019 to June 30, 2020 $ 59,252  
July 1, 2020 to June 30, 2021 49,297  
July 1, 2021 to June 30, 2022 40,248  
July 1, 2022 to June 30, 2023 33,200  
July 1, 2023 to June 30, 2024 25,094  
Thereafter 76,390  
Total minimum lease payments 283,481  
Less: Amount of lease payments representing interest (38,362)  
Present value of future minimum lease payments 245,119  
Current portion of lease liabilities 49,970 $ 0
Noncurrent portion of lease liabilities 195,149 0
Finance Leases    
July 1, 2019 to June 30, 2020 4,709  
July 1, 2020 to June 30, 2021 3,015  
July 1, 2021 to June 30, 2022 1,912  
July 1, 2022 to June 30, 2023 898  
July 1, 2023 to June 30, 2024 243  
Thereafter 157  
Total minimum lease payments 10,934  
Less: Amount of lease payments representing interest (658)  
Present value of future minimum lease payments [1] 10,276 $ 4,213
Current portion of lease liabilities 4,379  
Noncurrent portion of lease liabilities $ 5,897  
[1]
See Note 14 - Leases for further disclosure regarding finance lease obligations.