Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current expense:
Federal	$ 21,055	$ 12,329	$ 43,850
State	8,676	6,763	13,039
Foreign and U.S. territories	5,550	3,435	6,573
Total current expense	35,281	22,527	63,462
Deferred expense (benefit):
Federal	(1,773)	(30,021)	(3,054)
State	1,278	5,560	(5,302)
Foreign and U.S. territories	46	1,365	(1,813)
Total deferred expense (benefit)	(449)	(23,096)	(10,169)
Total tax expense (benefit)	$ 34,832	$ (569)	$ 53,293