Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 52,972	$ 48,961	$ 101,842	$ 30,553
Cumulative effect of accounting change					$ (12,207)
Net loss	(3,125)	80,277	17,913	191,842
Other comprehensive income (loss)	(18,774)	5,639	22,509	(11,225)
Dividends paid	(8,508)	(35,183)	(26,854)	(105,296)
Issuance of common stock	1,145	1,719	(588)	(1,407)
Conversion to common stock	0	0	0	0
Redemption of preferred/preference stock			(277)
Stock-based compensation expense	6,702	6,618	15,867	15,771
Repurchase of common stock	(5,000)		(105,000)
Balances, end of period	$ 25,412	$ 108,031	$ 25,412	$ 108,031
Dividends paid (USD per share)	$ 0.05	$ 0.1875	$ 0.15	$ 0.5625
Preferred stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 0	$ 1	$ 1	$ 1
Redemption of preferred/preference stock			(1)
Balances, end of period	0	1	0	1
Preference stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	0	415	396	441
Conversion to common stock	0	(12)	(130)	(38)
Redemption of preferred/preference stock			(266)
Balances, end of period	0	403	0	403
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	105,341	122,732	121,475	138,367
Issuance of common stock	(10,146)	(11,190)	(32,877)	(35,457)
Conversion to common stock	(246)	(242)	(2,804)	(763)
Redemption of preferred/preference stock			(10)
Stock-based compensation expense	6,702	6,618	15,867	15,771
Balances, end of period	101,651	117,918	101,651	117,918
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	5,282,374	5,103,588	5,279,682	5,074,343
Cumulative effect of accounting change					$ (12,207)
Net loss	(3,125)	80,277	17,913	191,842
Dividends paid	(8,508)	(35,183)	(26,854)	(105,296)
Balances, end of period	5,270,741	5,148,682	5,270,741	5,148,682
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(907,678)	(811,804)	(948,961)	(794,940)
Other comprehensive income (loss)	(18,774)	5,639	22,509	(11,225)
Balances, end of period	(926,452)	(806,165)	(926,452)	(806,165)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(4,750,403)	(4,689,309)	(4,674,089)	(4,710,997)
Issuance of common stock	11,291	12,909	32,289	34,050
Conversion to common stock	246	254	2,934	801
Repurchase of common stock	(5,000)		(105,000)
Balances, end of period	$ (4,743,866)	$ (4,676,146)	$ (4,743,866)	$ (4,676,146)

Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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