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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Offering of common stock shares	120,000,000	120,000,000
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance	3,400,000
Common stock shares granted to outside directors	50,000
Expiration period of stock options granted	10 years
Fair market value percent	100.00%
Options exercisable percentage	25.00%
Compensation costs prior to forfeiture	$ 5.9
Weighted average remaining recognition period	2 years 2 months 12 days
ATM Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering of common stock shares		10,000,000
Deferred financing costs	$ 0.1	$ 0.1
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock compensation expense	$ 4.7
Performance Awards vested	0
Performance Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance awards expiration date	Dec. 31, 2026
Performance Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance awards expiration date	Dec. 31, 2022

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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