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Compensation Plans (Restricted Stock Units) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 2011 [Member]	Dec. 31, 2011 2011 [Member]	Dec. 31, 2011 2011 [Member] Maximum [Member]	Dec. 31, 2011 2011 [Member] Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued	139,000	76,000				524,000
Unrecognized compensation expense	$ 6,200					$ 10,700
Vesting period of compensation expense not yet recognized			4 years	2 years			3 years	1 year
Compensation expense recognized	$ 1,200	$ 1,100			$ 2,500	$ 1,800

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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