Significant Accounting Policies (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Impairment charges	$ 0	$ 0	$ 6,000
Building and improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of property and equipment	35 years
Building and improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of property and equipment	40 years
Furniture, equipment and software [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of property and equipment	3 years
Furniture, equipment and software [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of property and equipment	10 years
Computer Software Developed For Internal Use [Member]
Significant Accounting Policies [Line Items]
Useful life of property and equipment	5 years
Computer Software Developed For Internal Use [Member] | General and Administrative Expense [Member]
Significant Accounting Policies [Line Items]
Impairment charges	500	4,300
Software Development, Cabling and Leasehold Improvements [Member] | General and Administrative Expense [Member]
Significant Accounting Policies [Line Items]
Impairment charges			$ 1,400