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Share-based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-Based Compensation
Share-based compensation expense	$ 6,291	$ 5,457	$ 12,286	$ 10,360
Stock awards
Share-Based Compensation
Vesting period			4 years
Share-based compensation expense	4,495	4,095	9,016	7,976
Performance shares
Share-Based Compensation
Vesting period			3 years
Share-based compensation expense	1,536	1,047	2,732	1,837
Restricted shares
Share-Based Compensation
Vesting period			1 year
Share-based compensation expense	212	263	444	444
Employee Stock Purchase Plan
Share-Based Compensation
Share-based compensation expense	$ 48	$ 52	$ 94	$ 103

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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