Consolidated Statements of Equity Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Beginning balance at Dec. 31, 2017	$ 995,041	$ 324,419	$ 382,127	$ 6,062,995	$ (106,923)	$ (5,667,577)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	147,699			147,699
Other comprehensive income, net of tax	7,026				7,026
Comprehensive income	154,725
Dividends declared	(30,121)			(30,121)
Treasury stock acquired	(5,831)					(5,831)
Stock-based awards activity	(2,415)		(87,296)			84,881
Stock-based compensation	7,967		7,967
Other activity	1,268		1,268
Ending balance at Jun. 30, 2018	1,116,911	324,419	304,066	6,201,694	(124,741)	(5,588,527)
Beginning balance at Mar. 31, 2018	1,036,636	324,419	303,926	6,124,209	(125,993)	(5,589,925)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	92,512			92,512
Other comprehensive income, net of tax	1,252				1,252
Comprehensive income	93,764
Dividends declared	(15,027)			(15,027)
Treasury stock acquired	(5,831)					(5,831)
Stock-based awards activity	2,216		(5,013)			7,229
Stock-based compensation	4,368		4,368
Other activity	785		785
Ending balance at Jun. 30, 2018	1,116,911	324,419	304,066	6,201,694	(124,741)	(5,588,527)
Beginning balance at Dec. 31, 2018	1,340,924	324,419	301,352	6,429,512	(136,511)	(5,577,848)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	153,934			153,934
Other comprehensive income, net of tax	2,317				2,317
Comprehensive income	156,251
Dividends declared	(30,297)			(30,297)
Company stock 401(k) contribution	3,244		(7,259)			10,503
Stock-based awards activity	(447)		(48,136)			47,689
Stock-based compensation	9,442		9,442
Other activity	625		625
Ending balance at Jun. 30, 2019	1,479,742	324,419	256,024	6,553,149	(134,194)	(5,519,656)
Beginning balance at Mar. 31, 2019	1,405,251	324,419	262,823	6,488,352	(135,432)	(5,534,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	79,955			79,955
Other comprehensive income, net of tax	1,238				1,238
Comprehensive income	81,193
Dividends declared	(15,158)			(15,158)
Company stock 401(k) contribution	3,244		(7,259)			10,503
Stock-based awards activity	(109)		(4,861)			4,752
Stock-based compensation	5,008		5,008
Other activity	313		313
Ending balance at Jun. 30, 2019	$ 1,479,742	$ 324,419	$ 256,024	$ 6,553,149	$ (134,194)	$ (5,519,656)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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