Share-Based Compensation and Equity - Unrecognized Compensation Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	$ 21,064
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	6,463
Weighted-Average Period (in years)	2.2
RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	9,646
Weighted-Average Period (in years)	1.7
Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	4,749
Weighted-Average Period (in years)	1.0
Director Deferred Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	$ 206
Weighted-Average Period (in years)	0.3