Annual report pursuant to Section 13 and 15(d)

SEGMENT DATA, Revenues and Identifiable Assets by Geographic Region (Details)

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SEGMENT DATA, Revenues and Identifiable Assets by Geographic Region (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 1,185,682 $ 1,790,025 $ 1,558,882 $ 849,409 $ 1,237,846 $ 1,835,806 $ 1,266,735 $ 723,361 $ 5,383,998 $ 5,063,748 $ 4,181,021
Long-lived assets 720,136       737,064       720,136 737,064 749,984
United Kingdom Operations [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 686,982 575,985 535,795
Long-lived assets 85,614       73,634       85,614 73,634 84,235
Other Foreign Operations [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 1,387,295 1,044,288 918,795
Long-lived assets 99,459       82,624       99,459 82,624 113,174
Total Foreign Operations [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 2,074,277 1,620,273 1,454,590
Long-lived assets 185,073       156,258       185,073 156,258 197,409
Total Domestic Operations [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 3,309,721 3,443,475 2,726,431
Long-lived assets $ 535,063       $ 580,806       $ 535,063 $ 580,806 $ 552,575