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Income Taxes - Income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 9,069	$ 21,156	$ 26,015
State	3,785	4,477	4,869
Total current	12,854	25,633	30,884
Deferred:
Charge in federal tax rate due to the 2017 Act		11,375
Federal	(13,381)	(3,193)	(7,748)
State	(2,941)	(1,781)	(646)
Total deferred	(16,322)	6,401	(8,394)
Total provision for income taxes	$ (3,468)	$ 32,034	$ 22,490
Statutory federal rate	21.00%	35.00%	35.00%
Tax benefit from 2017 Act	$ 1,200

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