Restructuring (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Charges [Abstract]
Impairment charges associated with our real estate investments	$ (3,093,000)	$ 1,452,000	$ 86,341,000
Severance costs	0	471,000	12,635,000
Impairment charges on assets held-for-sale or abandoned	0	226,000	7,521,000
Lease termination costs, net of estimated sublease income	(635,000)	32,000	2,782,000
Restructuring (gain) charges	(3,728,000)	2,181,000	109,279,000
Restructuring liabilities	1,500,000	2,400,000
Minimum [Member]
Restructuring Charges [Abstract]
Expected restructuring charges	8,000,000
Employee Severance, Salaried Employees [Member]
Restructuring Charges [Abstract]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent			17.00%
Noncontrolling Interest [Member]
Restructuring Charges [Abstract]
Impairment charges associated with our real estate investments		$ 20,000,000

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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+ Details