Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 44,580	$ 52,972	$ 286,096	$ 101,842
Net (loss) income	11,389	(3,125)	(200,423)	17,913
Other comprehensive income (loss)	22,690	(18,774)	26,571	22,509
Dividends paid	(8,594)	(8,508)	(25,693)	(26,854)
Issuance of common stock	774	1,145	(762)	(588)
Conversion to common stock		0		0
Redemption of preferred/preference stock				(277)
Stock-based compensation expense	8,286	6,702	15,236	15,867
Repurchase of common stock		(5,000)		(105,000)
Balances, end of period	$ 79,125	$ 25,412	$ 79,125	$ 25,412
Dividends paid (USD per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Cumulative Effect
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			$ (21,900)
Preferred stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period				$ 1
Redemption of preferred/preference stock				(1)
Balances, end of period		$ 0		0
Preference stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period				396
Conversion to common stock				(130)
Redemption of preferred/preference stock				(266)
Balances, end of period		0		0
Common stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 323,338	323,338	323,338	323,338
Balances, end of period	323,338	323,338	323,338	323,338
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	68,498	105,341	98,748	121,475
Issuance of common stock	(9,272)	(10,146)	(46,472)	(32,877)
Conversion to common stock		(246)		(2,804)
Redemption of preferred/preference stock				(10)
Stock-based compensation expense	8,286	6,702	15,236	15,867
Balances, end of period	67,512	101,651	67,512	101,651
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	5,188,119	5,282,374	5,438,930	5,279,682
Net (loss) income	11,389	(3,125)	(200,423)	17,913
Dividends paid	(8,594)	(8,508)	(25,693)	(26,854)
Balances, end of period	5,190,914	5,270,741	5,190,914	5,270,741
Retained earnings | Cumulative Effect
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(21,900)
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(836,262)	(907,678)	(840,143)	(948,961)
Other comprehensive income (loss)	22,690	(18,774)	26,571	22,509
Balances, end of period	(813,572)	(926,452)	(813,572)	(926,452)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(4,699,113)	(4,750,403)	(4,734,777)	(4,674,089)
Issuance of common stock	10,046	11,291	45,710	32,289
Conversion to common stock		246		2,934
Repurchase of common stock		(5,000)		(105,000)
Balances, end of period	$ (4,689,067)	$ (4,743,866)	$ (4,689,067)	$ (4,743,866)