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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 1,437,227 $ 1,963,146 $ 1,550,677 $ 867,997 $ 1,185,682 $ 1,790,025 $ 1,558,882 $ 849,409 $ 5,819,047 $ 5,383,998 $ 5,063,748
Long-lived assets 721,786       720,136       721,786 720,136 737,064
United Kingdom Operations [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 711,989 686,982 575,985
Long-lived assets 87,790       85,614       87,790 85,614 73,634
Other Foreign Operations [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 1,368,768 1,387,295 1,044,288
Long-lived assets 102,706       99,459       102,706 99,459 82,624
Total Foreign Operations [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 2,080,757 2,074,277 1,620,273
Long-lived assets 190,496       185,073       190,496 185,073 156,258
Total Domestic Operations [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 3,738,290 3,309,721 3,443,475
Long-lived assets $ 531,290       $ 535,063       $ 531,290 $ 535,063 $ 580,806