Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 86,356	$ 62,914	$ 101,842	$ 30,553
Cumulative effect of accounting change					$ (12,207)
Net income	23,697	51,595	21,038	111,565
Other comprehensive income (loss)	10,394	(36,614)	41,283	(16,864)
Dividends paid	(8,938)	(35,097)	(18,346)	(70,113)
Issuance of common stock	217	283	(1,733)	(3,126)
Conversion to common stock	0	0	0	0
Preferred Stock Redemption Premium			(277)
Stock-based compensation expense	2,381	5,880	9,165	9,153
Repurchase of common stock	(60,858)		(100,000)
Balances, end of period	$ 52,972	$ 48,961	$ 52,972	$ 48,961
Dividends paid (USD per share)	$ 0.05	$ 0.1875	$ 0.10	$ 0.375
Preferred stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 1	$ 1	$ 1	$ 1
Preferred Stock Redemption Premium			(1)
Balances, end of period	0	1	0	1
Preference stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	388	422	396	441
Conversion to common stock	(122)	(7)	(130)	(26)
Preferred Stock Redemption Premium			(266)
Balances, end of period	0	415	0	415
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	109,166	119,647	121,475	138,367
Issuance of common stock	(3,807)	(2,660)	(22,731)	(24,267)
Conversion to common stock	(2,389)	(135)	(2,558)	(521)
Preferred Stock Redemption Premium			(10)
Stock-based compensation expense	2,381	5,880	9,165	9,153
Balances, end of period	105,341	122,732	105,341	122,732
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	5,267,615	5,087,090	5,279,682	5,074,343
Cumulative effect of accounting change					$ (12,207)
Net income	23,697	51,595	21,038	111,565
Dividends paid	(8,938)	(35,097)	(18,346)	(70,113)
Balances, end of period	5,282,374	5,103,588	5,282,374	5,103,588
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(918,072)	(775,190)	(948,961)	(794,940)
Other comprehensive income (loss)	10,394	(36,614)	41,283	(16,864)
Balances, end of period	(907,678)	(811,804)	(907,678)	(811,804)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(4,696,080)	(4,692,394)	(4,674,089)	(4,710,997)
Issuance of common stock	4,024	2,943	20,998	21,141
Conversion to common stock	2,511	142	2,688	547
Repurchase of common stock	(60,858)		(100,000)
Balances, end of period	$ (4,750,403)	$ (4,689,309)	$ (4,750,403)	$ (4,689,309)

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

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