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Income Taxes Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision	$ 14,256,000	$ 16,629,000	$ 28,695,000	$ 34,362,000
Pretax income	$ 56,937,000	$ 64,159,000	$ 114,134,000	$ 133,124,000
Effective income tax rate	25.04%	25.92%	25.14%	25.81%
Unrecognized tax benefits	$ 2,300,000		$ 2,300,000		$ 2,300,000
Interest accrued	520,000		520,000		470,000
Penalties accrued	0		0		$ 0
Decrease in unrecognized tax benefits is reasonably possible	$ 2,300,000		$ 2,300,000

X

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations.

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