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Employee Stock Plans (Disclosure) (Details) (USD $)	3 Months Ended		9 Months Ended
Employee Stock Plans (Disclosure) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,097,000	$ 1,795,000	$ 6,225,000	$ 4,831,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value	0	0	0	0
Unrecognized compensation expense	$ 0	$ 0	$ 0	$ 0

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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