Segment Information (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 53,097,879	$ 50,383,152
US Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	18,140,825	16,554,509
US Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	13,712,106	13,405,878
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	31,852,931	29,960,387
Canada Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,846,682	3,604,344
Canada Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	85,405	27,543
Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,932,087	3,631,887
EMEA Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,559,124	2,757,593
EMEA Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,876,131	4,162,703
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,435,255	6,920,296
Asia Pacific Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,968,081	3,227,530
Asia Pacific Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	676,281	742,528
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,644,362	3,970,058
Corporate Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,233,244	$ 5,900,524