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Income Taxes - Summary of Income Tax Expense (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
Income tax expense:
Current									$ 14,714	$ 10,922	$ 8,701
Deferred									10,174	1,941	666
Change in valuation allowance for deferred tax asset									(10)	(54)	(946)
Income tax expense	$ 8,327	$ 5,104	$ 5,331	$ 6,116	$ 4,134	$ 3,099	$ 2,679	$ 2,897	$ 24,878	$ 12,809	$ 8,421

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 9
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-Publisher FASB
-Name Accounting Standards Codification
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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-Publisher FASB
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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