Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease cost

The following tables provide other additional information related to operating lease liabilities:

	March 31, 2019
Weighted average remaining lease term	8 years
Weighted average discount rate	3.86		%
	Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows (dollars in thousands):	$	3,087

The following table provides information related to our lease costs for the three months ended March 31, 2019 (dollars in thousands):

	Three Months Ended   March 31, 2019
	Purchased Power Lease Contracts		Land, Property & Equipment Leases		Total
Operating lease cost	$	—	$	4,348	$	4,348
Variable lease cost	17,290		—		17,290
Total lease cost	$	17,290	$	4,348	$	21,638

Schedule of future minimum payments

The following table provides information related to the maturity of our operating lease liabilities at March 31, 2019 (dollars in thousands):

	March 31, 2019
Year	Purchased Power Lease Contracts		Land, Property & Equipment Leases		Total
2019 (remaining nine months of 2019)	$	54,499	$	10,539	$	65,038
2020	—		12,424		12,424
2021	—		9,585		9,585
2022	—		6,621		6,621
2023	—		5,496		5,496
Thereafter	—		41,618		41,618
Total lease commitments	54,499		86,283		140,782
Less imputed interest	814		20,829		21,643
Total lease liabilities	$	53,685	$	65,454	$	119,139

The following table provides information related to estimated future minimum operating lease payments at December 31, 2018 (dollars in thousands):

	December 31, 2018
Year	Purchased Power Lease Contracts		Land, Property & Equipment Leases		Total
2019	$	54,499	$	13,747	$	68,246
2020	—		12,428		12,428
2021	—		9,478		9,478
2022	—		6,513		6,513
2023	—		5,359		5,359
Thereafter	—		42,236		42,236
Total future lease commitments	$	54,499	$	89,761	$	144,260