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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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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

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Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Stockholders’ Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Stockholders’ Equity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ 48,214	$ 48,901	101,727	114,034
Other comprehensive income (loss)	(38,256)	54,510	(18,078)	80,818
Dividends paid			(70,113)	(69,527)
Issuance of common stock			(3,126)	(4,823)
Conversion to common stock			0	0
Stock-based compensation expense			9,153	12,531
Balances, end of period	195,917	29,373	195,917	29,373
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			(26)	(20)
Balances, end of period	415	463	415	463
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			(24,267)	(28,567)
Conversion to common stock			(521)	(398)
Stock-based compensation expense			9,153	12,531
Balances, end of period	122,732	131,691	122,732	131,691
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			101,727	114,034
Dividends paid			(70,113)	(69,527)
Balances, end of period	5,248,991	5,152,241	5,248,991	5,152,241
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(792,173)	(940,133)
Other comprehensive income (loss)			(18,078)	80,818
Balances, end of period	(810,251)	(859,315)	(810,251)	(859,315)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(4,710,997)	(4,743,208)
Issuance of common stock			21,141	23,744
Conversion to common stock			547	418
Balances, end of period	$ (4,689,309)	$ (4,719,046)	$ (4,689,309)	$ (4,719,046)