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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal
Current									$ 32,282	$ 24,521	$ 24,825
Deferred									13,980	665	(427)
Total Federal									46,262	25,186	24,398
State
Current									323	248	0
Deferred									(148)	(129)	0
Total State									175	119	0
Total Federal and State	$ 22,255	$ 8,883	$ 8,604	$ 6,695	$ 6,510	$ 7,367	$ 5,496	$ 5,931	$ 46,437	$ 25,305	$ 24,398

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- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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