Segment Information (Total Assets of Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 43,171,051	$ 39,674,473
US Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	13,659,119	13,285,423
US Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,706,053	11,716,908
Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,074,727	4,103,730
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,407,325	2,230,568
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,817,197	3,597,456
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 5,506,630	$ 4,740,388