Stockholders' Equity Stockholders' Equity (Summary of Options) (Details) - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Period Adjustment		0	18	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,553
Common Stock, Capital Shares Reserved for Future Issuance	1,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	1,650	1,695	1,381
Granted (in shares)	462	236	653
Exercised (in shares)	(159)	(112)	(110)
Canceled or expired (in shares)	(19)	(187)	(229)
Outstanding at end of year (in shares)	1,934	1,650	1,695
Exercisable at end of year (in shares)	1,225	1,106	583
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)	$ 19.18	$ 18.95	$ 17.07
Adjustment to beginning balance (in usd per share)		0.00	18.94	$ 0.00
Granted (in usd per share)	26.56	20.06	22.66
Exercised (in usd per share)	19.81	13.76	14.36
Canceled or expired (in usd per share)	23.17	21.30	20.39
Outstanding at end of year (in usd per share)	20.85	19.18	18.95
Exercisable at end of year (in usd per share)	$ 18.68	$ 18.21	$ 15.00
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)	1,918

Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Period Adjustment

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- Definition

Share-Based Compensation Arrangment By Share-Based Payment Award, Options Outstanding, Weighted Average Exercise Price, Adjustment

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Aggregate number of common shares reserved for future issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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