Share-Based Compensation and Equity - Unrecognized Compensation Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	$ 13,308
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	2,948
Weighted-Average Period (in years)	2 years 1 month
Restricted Stock Units [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	7,361
Weighted-Average Period (in years)	1 year 8 months
Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	2,836
Weighted-Average Period (in years)	1 year 1 month
Director Deferred Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Cost	$ 163
Weighted-Average Period (in years)	0 years 3 months