Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current federal	$ 7,594	$ 38,859	$ 43,777
Current state	5,538	4,112	1,689
Total current provision	13,132	42,971	45,466
Deferred federal	41,078	48,653	(6,127)
Deferred state	4,136	1,178	(1,712)
Total deferred provision	45,214	49,831	(7,839)
Total included in net income	$ 58,346	$ 92,802	$ 37,627