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Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Non-employee director stock option plan, term in years			10
Additional shares available for issuance	4,100,000		4,100,000
Compensation cost	$ 1,500,000	$ 1,900,000	$ 2,600,000	$ 3,200,000
Percentage of performance goal to be achieved for target number of shares to be vest			100.00%
Targeted number of performance based restricted stock unit awards			100,000
Options issued	3,000	61,000	399,000	61,000
Tax benefit from share based compensation			41,000	240,000
Closing stock price			16.50
Restricted Shares [Member]
Vesting period, years			Four
Unrecognized compensation cost	4,700,000		4,700,000
Unrecognized compensation, years			2.9
Tax benefit from share based compensation			(1,000)	24,000
Stock Options [Member]
Vesting period, years			four
Contractual life of options			10
Unrecognized compensation cost	6,200,000		6,200,000
Unrecognized compensation, years			1.7
Weighted-average grant date fair value, per option	$ 6.55		$ 8.14
Proceeds from stock option exercise			1,500,000	1,600,000
Tax benefit from share based compensation			300,000	1,100,000
Intrinsic value			800,000	800,000
Restricted Stock Units And Phantom Stock [Member]
Vesting period, years			four
Unrecognized compensation cost	1,800,000		1,800,000
Unrecognized compensation, years			2.4
Performance Based Restricted Stock Units [Member]
Unrecognized compensation, years			3.7
Proceeds from stock option exercise			$ 1,600,000

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Closing Stock Price

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Percentage of performance goal to be achieved for target number of shares to be vest.

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Share based compensation arrangement by share based payment target number of performance based restricted stock unit awards to be earned.

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Term Of Non-Employee Director Stock Option Plan

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As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees under share-based compensation plans that have yet to vest.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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The weighted average period over which unrecognized compensation is expected to be recognized for share-based compensation plans, using a decimal to express in number of years.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element reduces net cash provided by operating activities.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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Share-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares newly issued during the reporting period under the plan.

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