Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 26,242	$ 25,268	$ 27,211
Additions based on tax positions related to the current year	10,427	8,944	401
Additions for tax positions of prior years	1,173	188	636
Reductions for tax positions of prior years	(280)	(4,539)	(2,958)
Reductions related to settlements with tax authorities	0	(1,886)	0
Reductions from lapse of statutes of limitations	(4,964)	(1,733)	(22)
Balance, end of period	32,598	$ 26,242	$ 25,268
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	6,400
Reductions from lapse of statutes of limitations	7,100
Liability for uncertain tax positions	28,300
Accrued and unpaid interest and penalties	$ 4,700