Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.36
Beginning Balance (in shares) at Dec. 31, 2016		55,051,000
Beginning Balance at Dec. 31, 2016		$ 876	$ 1,558,594	$ (223,856)	$ (1,115,962)	$ 249,763
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 269,659		269,659
Other comprehensive income (loss)	56,968			56,968
Dividends declared on common stock			(40,493)
Stock compensation expense						14,639
Net issuance of treasury stock for vested restricted stock units (in shares)		192,000
Net issuance of treasury stock for vested restricted stock units					(2,797)	(1,326)
Two-for-one stock split (in shares)		55,142,000
Two-for-one stock split		$ 875				(875)
Repurchases of common stock (in shares)		0
Repurchases of common stock					0
Adoption of accounting standards update related to leases in 2019, revenue recognition in 2018 and reclassification of certain tax effects in 2017	(22,085)		22,085
Adoption of accounting standards update related to reclassification of certain tax effects				(22,085)
Ending Balance at Dec. 31, 2017	$ 766,065	$ 1,751	1,809,845	(188,973)	(1,118,759)	262,201
Ending Balance (in shares) at Dec. 31, 2017		110,385,000
Common Stock, Dividends, Per Share, Declared	$ 0.40
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 223,994		223,994
Other comprehensive income (loss)	(79,835)			(79,835)
Dividends declared on common stock			(45,115)
Stock compensation expense						14,923
Net issuance of treasury stock for vested restricted stock units (in shares)		233,000
Net issuance of treasury stock for vested restricted stock units					(1,995)	(1,062)
Two-for-one stock split (in shares)		0
Two-for-one stock split		$ 0				0
Repurchases of common stock (in shares)		(188,000)
Repurchases of common stock					(4,771)
Adoption of accounting standards update related to leases in 2019, revenue recognition in 2018 and reclassification of certain tax effects in 2017			9,061
Adoption of accounting standards update related to reclassification of certain tax effects				0
Ending Balance at Dec. 31, 2018	$ 881,265	$ 1,751	1,997,785	(268,808)	(1,125,525)	276,062
Ending Balance (in shares) at Dec. 31, 2018	110,429,596	110,430,000
Common Stock, Dividends, Per Share, Declared	$ 0.44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 193,814		193,814
Other comprehensive income (loss)	9,066			9,066
Dividends declared on common stock			(49,704)
Stock compensation expense						17,078
Net issuance of treasury stock for vested restricted stock units (in shares)		758,000
Net issuance of treasury stock for vested restricted stock units					(11,774)	(3,718)
Two-for-one stock split (in shares)		0
Two-for-one stock split		$ 0				0
Repurchases of common stock (in shares)		(408,000)
Repurchases of common stock					(12,112)
Adoption of accounting standards update related to leases in 2019, revenue recognition in 2018 and reclassification of certain tax effects in 2017			(593)
Adoption of accounting standards update related to reclassification of certain tax effects				0
Ending Balance at Dec. 31, 2019	$ 1,023,322	$ 1,751	$ 2,141,302	$ (259,742)	$ (1,149,411)	$ 289,422
Ending Balance (in shares) at Dec. 31, 2019	110,780,464	110,780,000