Operating Segments and Related Information Operating Segments and Related Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 369,380	$ 389,329	$ 720,923	$ 737,912
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	191,108	214,003	352,846	385,017
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	85,771	87,571	180,845	178,726
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 92,501	$ 87,755	$ 187,232	$ 174,169