Leases

PSE leases buildings and assets under operating leases. Certain leases contain purchase options, renewal options and escalation provisions. Payments received for the subleases of properties were immaterial for each of the years ended 2018, 2017 and 2016.

Operating lease expenses net of sublease receipts were:



(Dollars in Thousands)
At December 31,	Operating Lease Expense
Years	Operating Lease Expense
2018	$	34,093
2017	35,198
2016	31,786

The following table summarizes the Company’s estimated future minimum lease payments for non-cancelable leases net of sublease receipts, through the terms of its existing contracts:



(Dollars in Thousands)	Future Minimum Lease Payments
At December 31,	Future Minimum Lease Payments
Years	Operating		Capital
2019	$	20,635	$	495
2020	20,704		446
2021	20,630		311
2022	20,202		82
2023	19,223		—
Thereafter	132,889		—
Total minimum lease payments	$	234,283	$	1,334