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Employee Stock Benefit Plans (Performance Share Activity) (Details) (Performance Shares, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance	0	123,826	171,861
Granted	0	0	0
Issued	0	(61,658)	(48,035)
Canceled	0	(62,168)	0
Ending balance	0	0	123,826
Compensation expense	$ 0	$ (129)	$ 481

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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