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Stockholders' Equity - Additional Information (Details) - USD ($)				3 Months Ended			6 Months Ended
	Jul. 25, 2017	Apr. 21, 2017	Feb. 17, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Nov. 30, 2014
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)		$ 0.07	$ 0.07	$ 0.07		$ 0.07	$ 0.14	$ 0.14
Payments of common stock dividends				$ 4,200,000	$ 4,200,000	$ 4,300,000	$ 8,400,000	$ 8,600,000
Value of shares repurchased								$ 33,100,000
November 2014 Repurchase Program
Subsequent Event [Line Items]
Authorized amount of common stock (shares)									$ 75,000,000
Shares repurchased (shares)				0		1,288,751	0	2,580,725
Value of shares repurchased						$ 16,800,000		$ 33,100,000
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.07

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- Definition

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

+ References

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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