Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lease, Cost [Abstract]
Finance lease cost - interest on lease liabilities		$ 1,734	$ 3,012	$ 3,793	$ 6,268
Operating lease cost, excluding short-term leases	[1]	567	720	1,135	1,436
Short-term lease cost	[2]	6,094	12,092	11,856	17,852
Variable lease cost	[3]	362	322	725	644
Total lease cost		$ 8,757	$ 16,146	$ 17,509	$ 26,200

[1] Operating lease cost reflect a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a straight-line basis.

[2] Short-term lease costs are reported at gross amounts and primarily represent costs incurred for drilling rigs, most of which are short-term contracts not recognized as a right-of-use asset and lease liability on the Condensed Consolidated Balance Sheets.

[3] Variable lease costs primarily represent differences between minimum payment obligations and actual operating charges incurred by the Company related to its long-term leases.