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Stockholders' Equity Stockholders' Equity (Summary of Options) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,848
Common Stock, Capital Shares Reserved for Future Issuance	2,801
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	1,523	1,934	1,650
Granted (in shares)	100	213	462
Exercised (in shares)	(247)	(459)	(159)
Canceled or expired (in shares)	(298)	(165)	(19)
Outstanding at end of year (in shares)	1,078	1,523	1,934
Exercisable at end of year (in shares)	643	1,001	1,225
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in usd per share)	$ 21.95	$ 20.85	$ 19.18
Granted (in usd per share)	24.35	25.43	26.56
Exercised (in usd per share)	17.37	17.73	19.81
Canceled or expired (in usd per share)	21.96	25.34	23.17
Outstanding at end of year (in usd per share)	23.22	21.95	20.85
Exercisable at end of year (in usd per share)	$ 22.02	$ 20.29	$ 18.68
Amended And Restated 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0
Common Stock, Capital Shares Reserved for Future Issuance	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at end of year (in shares)	844

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Aggregate number of common shares reserved for future issuance.

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