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Leased Assets and Liabilities (Operating and Finance Lease Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Operating $ 152,139 $ 156,788
Finance 11,536 10,683
Total leased assets 163,675 167,471
Current operating lease liabilities 35,219 37,208
Noncurrent operating lease liabilities 124,873 127,237
Accounts payable and accrued liabilities 2,844 2,708
Other noncurrent liabilities 7,651 7,054
Total lease liabilities $ 170,587 $ 174,207
Maximum    
Lessee, Lease, Description [Line Items]    
Term of contract 15 years  
Option to extend 5 years