Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance lease costs:
Amortization of right-of-use assets		$ 2,779
Interest on lease liabilities		242
Operating lease costs		92,709
Short-term lease costs		20,578
Variable lease costs		29,024
Sublease income		(463)
Total lease costs		144,869
Operating cash flows from operating leases		23,644
Investing cash flows from operating leases		71,487
Operating cash flows from finance leases		242
Financing cash flows from finance leases		2,746	$ 0	$ 0
Right-of-use assets obtained in exchange for lease obligations, operating leases		109,681
Right-of-use assets obtained in exchange for lease obligations, finance leases		$ 2,618
Oil And Natural Gas Properties
Finance lease costs:
Operating lease costs	$ 69,100
Short-term lease costs	3,100
Variable lease costs	19,600
General and Administrative Expense
Finance lease costs:
Operating lease costs	10,100
Variable lease costs	9,400
Lease Operating Expenses
Finance lease costs:
Operating lease costs	7,100
Short-term lease costs	17,500
Other operating expenses
Finance lease costs:
Operating lease costs	$ 6,400