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Shareholders' Equity (Details 3) (Unvested Restricted Stock, USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unvested Restricted Stock
Unvested Restricted Stock Outstanding
Balance at the beginning of the period (in shares)	446	386	419
Granted (in shares)	798	353
Vested (in shares)	(128)	(284)	(26)
Forfeited (in shares)	(16)	(9)	(7)
Balance at the end of the period (in shares)	1,100	446	386	419
Additional Disclosure
Balance at the beginning of the period (in dollars per share)	$ 34.07	$ 20.84	$ 20.88
Granted (in dollars per share)	$ 40.19	$ 37.40
Vested (in dollars per share)	$ 26.26	$ 20.49	$ 21.30
Forfeited (in dollars per share)	$ 37.24	$ 26.45	$ 20.95
Balance at the end of the period (in dollars per share)	$ 39.38	$ 34.07	$ 20.84	$ 20.88
Aggregate Intrinsic Value	$ 45,295,000	$ 18,707,000	$ 13,991,000	$ 11,245,000
Weighted Average Remaining Vesting Term	3 years 4 months 24 days	2 years 2 months 12 days	7 months 6 days	1 year 8 months 12 days
Aggregate value of awards vested	$ 5,300,000	$ 10,600,000	$ 700,000

X

- Definition

The aggregate intrinsic value of outstanding awards of equity-based plans excluding option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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