Leases (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Components of Lease Expense

The components of lease expense are as follows (in thousands):

		Three Months Ended June 30,				Six Months Ended June 30,
	Classification on the Statement of Operations	2020		2019		2020		2019
Operating lease expense:
Operating lease expense	Operating expense	$	4,432	$	4,273	$	8,880	$	8,325
Short-term and variable lease expense	Operating expense	563		11,251		9,367		23,065
Finance lease expense:
Interest expense on lease liabilities	Interest expense, net	24,886		24,632		49,707		49,235
Amortization of ROU assets	Depreciation and amortization expense	4,069		2,628		8,158		5,139
Total lease expense		$	33,950	$	42,784	$	76,112	$	85,764

Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases is as follows (in thousands):

	Six Months Ended June 30,
	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	10,411	$	13,698
Operating cash flows for financing obligation and finance leases	$	44,527	$	43,862