Income Taxes (Schedule of Changes in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total amounts of unrecognized tax benefits, beginning of period	$ 21,417	$ 18,463
Gross increases in unrecognized tax benefits as a result of tax positions taken during a prior period	2,991	74	$ 75
Gross increases in unrecognized tax benefits as a result of tax positions taken in the current period	461	4,681	12,657
Decreases in unrecognized tax benefits relating to settlements with taxing authorities	0	(713)	(1,326)
Decreases in unrecognized tax benefits as a result of a lapse of the applicable statutes of limitations	(622)	(1,088)	(147)
Total amounts of unrecognized tax benefits, end of period	$ 24,247	$ 21,417	$ 18,463