Segment Information (Total Assets of Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 42,910,363	$ 39,674,473
US Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	13,682,559	13,285,423
US Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,648,160	11,716,908
Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,120,395	4,103,730
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,239,282	2,230,568
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,712,954	3,597,456
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 5,507,013	$ 4,740,388