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Stock-Based Compensation Plans and Employee Benefits (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Y	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,447,000	$ 4,314,000	$ 8,113,000	$ 8,469,000
Unrecognized compensation cost	$ 17,000,000		$ 17,000,000
Weighted-average period to recognize the unrecognized compensation cost (in years)			1.08
Long-term Incentive Plan 2006 and 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)	4.1		4.1

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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