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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Income	$ 79,525	$ 131,390	$ 32,637	$ 69,261	$ 117,049	$ 31,339	$ 243,551	$ 217,649
Weighted average shares outstanding: [Abstract]
Basic (in shares)	39,933			40,422			39,750	40,416
Effect of dilutive securities: [Abstract]
Stock options and employee stock purchase plan (in shares)	932			1,375			1,061	1,415
Diluted (in shares)	40,865			41,797			40,811	41,831
Basic (in dollars per share)	$ 1.99			$ 1.71			$ 6.13	$ 5.39
Diluted (in dollars per share)	$ 1.95			$ 1.66			$ 5.97	$ 5.20
Anti-dilutive stock options excluded from diluted earnings per share computations (in shares)	0			0			1	0

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