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Stock Repurchases - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 02, 2016
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased	0	0
Stock repurchases			$ 50,021,000
August 2012 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchases program, authorized amount				$ 50,000,000.0
2016 and 2014 Share Repurchase Programs
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount	$ 54,900,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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