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Equity Incentive Plan Details 3 (Details) (USD $)	12 Months Ended
Equity Incentive Plan Details 3 (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Aggregate Intrinsic Value [Abstract]
Restricted Stock Units, Nonvested, Intrinsic Value	$ 25,300,000	$ 20,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock Units, Nonvested, Number, Beginning	139,774
Restricted Stock Units, Grants in Period	43,078	42,067
Restricted Stock Units, Vested in Period	(47,713)
Restricted Stock Units, Forfeited in Period	(4,114)
Restricted Stock Units, Nonvested, Number, Ending	131,025	139,774

The intrinsic value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) 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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- Definition

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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