Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net gain on available-for-sale securities	$ (1,021)		$ 9,299	$ (288)
Unrealized net losses on cash flow hedges	(2,034,922)		(1,791,208)	(1,495,827)
Consolidated net income	339,523		352,547	355,630
Amount reclassified from Accumulated other comprehensive income (loss), net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Consolidated net income	(2,726)
Amount reclassified from Accumulated other comprehensive income (loss), net of tax | Unrealized net gain on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net gain on available-for-sale securities	203
Amount reclassified from Accumulated other comprehensive income (loss), net of tax | Unrealized net losses on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net losses on cash flow hedges	$ (2,929)	[1]

[1] Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.