Share Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options Outstanding Summary [Line Items]
Balance,	1,459		3,504
Exercise Price, Lower Range Limit	$ 16.97	$ 16.97	$ 3.91	$ 1.49
Exercise Price, Upper Range Limit	$ 98.87	$ 98.87	$ 98.87	$ 98.87
Balance,	1,357	1,459		3,504
Number Of Options [Member]
Stock Options Outstanding Summary [Line Items]
Balance,		2,230
Granted			0
Forfeited	(68)	(99)	(68)
Exercised	(34)	(672)	(1,206)
Balance,			2,230
Weighted Average Exercise Price [Member]
Stock Options Outstanding Summary [Line Items]
Exercise Price, Lower Range Limit Granted			$ 0
Exercise Price, Upper Range Limit Granted			$ 0
Exercise Price, Lower Range Limit Forfeited	$ 25.08	$ 51.60	$ 51.60
Exercise Price, Upper Range Limit Forfeited	$ 75.18	$ 75.18	$ 76.01
Exercise Price, Lower Range Limit Exercised	$ 16.97	$ 3.91	$ 1.49
Exercise Price, Upper Range Limit Exercised	$ 19.18	$ 33.57	$ 45.95