Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The gross value of stock issued during the period upon the conversion of convertible securities.

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Stockholders’ Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Stockholders’ Equity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			$ 188,561	$ (103,660)
Cumulative effect of accounting changes					$ (12,207)
Net income	$ 76,953	$ 57,358	178,680	171,392
Other comprehensive income (loss)	5,642	40,831	(12,436)	121,649
Dividends paid			(105,296)	(104,524)
Issuance of common stock			(1,407)	(2,336)
Conversion to common stock			0	0
Stock-based compensation expense			15,771	18,312
Balances, end of period	251,666	100,833	251,666	100,833
Preferred stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			1	1
Balances, end of period	1	1	1	1
Preference stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			441	483
Conversion to common stock			(38)	(26)
Balances, end of period	403	457	403	457
Common stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			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			138,367	148,125
Issuance of common stock			(35,457)	(32,538)
Conversion to common stock			(763)	(505)
Stock-based compensation expense			15,771	18,312
Balances, end of period	117,918	133,394	117,918	133,394
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			5,229,584	5,107,734
Cumulative effect of accounting changes					$ (12,207)
Net income			178,680	171,392
Dividends paid			(105,296)	(104,524)
Balances, end of period	5,290,761	5,174,602	5,290,761	5,174,602
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(792,173)	(940,133)
Other comprehensive income (loss)			(12,436)	121,649
Balances, end of period	(804,609)	(818,484)	(804,609)	(818,484)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(4,710,997)	(4,743,208)
Issuance of common stock			34,050	30,202
Conversion to common stock			801	531
Balances, end of period	$ (4,676,146)	$ (4,712,475)	$ (4,676,146)	$ (4,712,475)