Annual report pursuant to Section 13 and 15(d)

SEGMENT DATA Geographical Region Information (Details)

v3.8.0.1
SEGMENT DATA Geographical Region Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Concentration Risk [Line Items]                      
Revenue $ 2,546,156 $ 3,559,418 $ 2,818,693 $ 1,413,181 $ 1,797,544 $ 3,170,416 $ 2,179,258 $ 1,207,716 $ 10,337,448 $ 8,354,934 $ 7,245,731
Long-lived assets 885,936       751,536       885,936 751,536 731,282
Total Foreign Operations [Member]                      
Concentration Risk [Line Items]                      
Revenue                 3,564,498 2,566,047 2,207,455
Long-lived assets 201,724       174,160       201,724 174,160 200,711
United Kingdom Operations [Member]                      
Concentration Risk [Line Items]                      
Revenue                 785,174 683,464 672,826
Long-lived assets 74,551       69,380       74,551 69,380 74,517
Other Foreign Operations [Member]                      
Concentration Risk [Line Items]                      
Revenue                 2,779,324 1,882,583 1,534,629
Long-lived assets 127,173       104,780       127,173 104,780 126,194
Total Domestic Operations [Member]                      
Concentration Risk [Line Items]                      
Revenue                 6,772,950 5,788,887 5,038,276
Long-lived assets $ 684,212       $ 577,376       $ 684,212 $ 577,376 $ 530,571
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                      
Concentration Risk [Line Items]                      
Concentration Risk, Percentage                 0.00% 0.00% 0.00%