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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

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