Discontinued Operations - Loss on Disposition, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 21, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total cash received, net of transaction costs and cash sold			$ 0	$ 12,780	$ 0
Total WD Services net asset value as of transaction date, net of cash sold		$ (36,499)		(36,499)
Income tax benefit				(51,861)
Gain on sale before reclassification of currency translation, net of tax				28,142
Disposal group, including discontinued operation, foreign currency translation gains (losses), reclassification				(29,973)
Gain on sale before reclassification of currency translation, net of tax				(1,831)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, foreign currency translation gains (losses), reclassification				$ (29,973)
WD Services | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit	$ 52,877		$ 37,433
Gain on sale before reclassification of currency translation, net of tax		$ (1,056)