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Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended					9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 30, 2014
Dividends Payable [Line Items]
Cash dividends declared per common share (usd per share)		$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.24	$ 0.23
Payments of common stock dividends		$ 4,900,000	$ 4,800,000	$ 4,800,000	$ 4,800,000	$ 14,500,000	$ 13,800,000
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased						48,409
Treasury stock purchases						$ 1,000,000.0	$ 0
Subsequent Event
Dividends Payable [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.08
November 2014 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount								$ 75,000,000.0

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Aggregate dividends declared during the period for each share of common stock outstanding.

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