Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Other Intangible Assets
Goodwill	$ 277,582	$ 492,398	$ 1,380,689
Other intangible assets	$ 370,562	$ 359,648
Goodwill as a percentage of total assets	12.40%
Other intangible assets as a percentage of total assets	16.60%
Number of issues that arise with respect to assets that require significant management estimates and judgment	2
Land Improvements
Estimated useful lives of property and equipment
Useful lives	15 years
Building and Building Improvements | Minimum
Estimated useful lives of property and equipment
Useful lives	5 years
Building and Building Improvements | Maximum
Estimated useful lives of property and equipment
Useful lives	31 years
Furniture, Fixtures and Equipment | Minimum
Estimated useful lives of property and equipment
Useful lives	3 years
Furniture, Fixtures and Equipment | Maximum
Estimated useful lives of property and equipment
Useful lives	31 years