Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 25,268	$ 27,211	$ 23,149
Additions based on tax positions related to the current year	8,944	401	1,419
Additions for tax positions of prior years	188	636	2,661
Reductions for tax positions of prior years	(4,539)	(2,958)	(1)
Reductions related to settlements with tax authorities	(1,886)	0	0
Reductions from lapse of statutes of limitations	(1,733)	(22)	(17)
Balance, end of period	26,242	$ 25,268	$ 27,211
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	1,000
Liability for uncertain tax positions	22,300
Accrued and unpaid interest and penalties	$ 3,900