Stockholders’ Equity (Deficit) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			$ (103,660)	$ 178,721
Net income	$ 57,358	$ 65,512	171,392	177,148
Other comprehensive income (loss)	40,831	14,465	121,649	62,673
Dividends paid			(104,524)	(105,791)
Issuance of common stock			(2,336)	(1,321)
Conversion to common stock			0	0
Stock-based compensation expense			18,312	16,289
Repurchase of common stock				(197,267)
Balances, end of period	100,833	130,452	100,833	130,452
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			483	505
Conversion to common stock			(26)	(16)
Balances, end of period	457	489	457	489
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			148,125	161,280
Issuance of common stock			(32,538)	(27,251)
Conversion to common stock			(505)	(321)
Stock-based compensation expense			18,312	16,289
Balances, end of period	133,394	149,997	133,394	149,997
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			5,107,734	5,155,537
Net income			171,392	177,148
Dividends paid			(104,524)	(105,791)
Balances, end of period	5,174,602	5,226,894	5,174,602	5,226,894
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(940,133)	(888,635)
Other comprehensive income (loss)			121,649	62,673
Balances, end of period	(818,484)	(825,962)	(818,484)	(825,962)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period			(4,743,208)	(4,573,305)
Issuance of common stock			30,202	25,930
Conversion to common stock			531	337
Repurchase of common stock				(197,267)
Balances, end of period	$ (4,712,475)	$ (4,744,305)	$ (4,712,475)	$ (4,744,305)

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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