Segment Information Revenues By Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers [Line Items]
Total revenues	$ 523,526	$ 495,491	$ 482,175	$ 447,536	$ 523,335	$ 504,063	$ 579,140	$ 571,640	$ 1,948,728	$ 2,178,178	$ 2,434,124
United States and Canada [Member]
Revenues from External Customers [Line Items]
Total revenues									851,295	1,014,739	1,182,775
EMEA [Member]
Revenues from External Customers [Line Items]
Total revenues									858,026	878,615	899,642
Other Countries [Member]
Revenues from External Customers [Line Items]
Total revenues									$ 239,407	$ 284,824	$ 351,707