Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated other comprehensive Income (loss)	Treasury Stock	Total
Balance, beginning at Dec. 31, 2018	$ 1,397	$ 2,495,853	$ 291,919	$ (132,195)	$ (132,135)	$ 2,524,839
Balance (in shares) at Dec. 31, 2018	134,874,302
Increase (Decrease) in Stockholders' Equity
Net income			69,924			69,924
Cash dividends declared ($0.26 per share)			(35,067)			(35,067)
Equity-based awards	$ 2	1,917	(325)		(1,529)	65
Equity-based awards (in shares)	137,713
Other comprehensive income, net of tax				53,441		53,441
Balance, ending at Mar. 31, 2019	$ 1,399	2,497,770	326,451	(78,754)	(133,664)	2,613,202
Balance (in shares) at Mar. 31, 2019	135,012,015
Balance, beginning at Dec. 31, 2019	$ 1,399	2,503,677	437,072	(31,749)	(270,141)	$ 2,640,258
Balance (in shares) at Dec. 31, 2019	129,928,479					129,928,479
Increase (Decrease) in Stockholders' Equity
Net income			38,865			$ 38,865
Cash dividends declared ($0.26 per share)			(33,782)			(33,782)
Equity-based awards	$ 2	2,800	(315)		(1,504)	983
Equity-based awards (in shares)	117,248
Common stock repurchased					(5,000)	(5,000)
Common stock repurchased (in shares)	(217,759)
Other comprehensive income, net of tax				35,878		35,878
Balance, ending at Mar. 31, 2020	$ 1,401	$ 2,506,477	429,323	$ 4,129	$ (276,645)	$ 2,664,685
Balance (in shares) at Mar. 31, 2020	129,827,968					129,827,968
Increase (Decrease) in Stockholders' Equity
Cumulative-effect adjustment of change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments			$ (12,517)			$ (12,517)