Financial Statements Schedules Schedule V. Valuation and Qualifying Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 171,456	$ 173,965	$ 268,418
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(4,562)	3,169
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	0	(105,600)
Valuation Allowances and Reserves, Additions for Adjustments	$ (7,071)	$ (7,976)