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Stockholders' Equity (Share Buyback Program) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 03, 2021
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 6,094	$ 5,560	$ 3,783	$ 4,329	$ 5,756	$ 10,950
November 2014 Share Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock buyback program, authorized amount	$ 160,000						$ 160,000
Increase authorized for share buyback program									$ 20,000
Treasury Stock, Shares, Acquired (in Shares)	317,212			214,256			820,637	1,190,362
Treasury Stock, Value, Acquired, Cost Method	$ 6,100			$ 4,300			$ 15,400	$ 21,000

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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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