XML 85 R71.htm IDEA: XBRL DOCUMENT v3.19.2
Leases - Lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating Leased Assets [Line Items]    
Operating lease cost $ 18,477 $ 22,825
Variable lease cost 41,889 59,180
Short-term lease cost 1,812 2,665
Total lease cost 62,178 84,670
Purchased Power Lease Contracts    
Operating Leased Assets [Line Items]    
Operating lease cost 14,063 14,063
Variable lease cost 41,529 58,820
Short-term lease cost 0 0
Total lease cost 55,592 72,883
Land, Property & Equipment Leases    
Operating Leased Assets [Line Items]    
Operating lease cost 4,414 8,762
Variable lease cost 360 360
Short-term lease cost 1,812 2,665
Total lease cost $ 6,586 $ 11,787