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Share-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
Share-Based Compensation (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-Based Compensation
Share-based compensation expense	$ 616,000	$ 455,000	$ 901,000	$ 869,000
Stock options
Share-Based Compensation
Share-based compensation expense	170,000	264,000	364,000	578,000
Cash received from stock option exercises			10,000	7,000
Restricted stock
Share-Based Compensation
Share-based compensation expense	$ 446,000	$ 191,000	$ 537,000	$ 291,000
Percentage of awards vesting at the grant date	50.00%		50.00%
Percentage of awards vesting on the first anniversary of the date of grant	50.00%		50.00%
Restricted stock \| Non-employee directors
Share-Based Compensation
Number of shares awarded	255,400
Restricted stock \| Officers
Share-Based Compensation
Number of shares awarded	32,200

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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