Information by Segment and Geographic Area (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	$ 3,046,018	$ 3,302,740	$ 3,038,678
Net Property, Plant and Equipment	1,266,225	1,274,484	1,366,973
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	1,108,051	1,087,454	1,010,290
Net Property, Plant and Equipment	242,890	276,966	291,470
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	331,894	398,222	420,458
Net Property, Plant and Equipment	115,775	114,521	141,014
All other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	1,606,073	1,817,064	1,607,930
Net Property, Plant and Equipment	$ 907,560	$ 882,997	$ 934,489