Income Taxes - Current and Deferred (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. federal	$ 1,210	$ (32,351)	$ (160,761)
State	318	1,811	(810)
Current Income Tax Expense (Benefit), Total	55,625	2,388	(102,080)
Deferred:
State	3,222	(113)	(3,226)
Deferred Income Tax Expense (Benefit), Total	35,951	76,881	19,110
Total income tax expense (benefit)	91,576	79,269	(82,970)
U.S. Drilling
Deferred:
U.S. federal	58,157	37,476	49,020
Outside the U.S
Current:
Outside the U.S.	54,097	32,928	59,491
Deferred:
Outside the U.S.	$ (25,428)	$ 39,518	$ (26,684)