Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 As Restated [Member]	Dec. 31, 2009 As Restated [Member]	Dec. 31, 2011 Americas	Dec. 31, 2010 Americas As Restated [Member]	Dec. 31, 2009 Americas As Restated [Member]	Dec. 31, 2011 Europe	Dec. 31, 2010 Europe As Restated [Member]	Dec. 31, 2009 Europe As Restated [Member]	Dec. 31, 2011 Asia/Pacific	Dec. 31, 2010 Asia/Pacific As Restated [Member]	Dec. 31, 2009 Asia/Pacific As Restated [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 691,243	$ 593,742	$ 390,968	$ 446,059	$ 391,379	$ 269,780	$ 136,671	$ 106,964	$ 82,279	$ 108,513	$ 95,399	$ 38,909
Identifiable Assets	$ 1,170,958	$ 1,131,942	$ 831,151	$ 951,804	$ 904,360	$ 704,230	$ 117,088	$ 126,179	$ 86,312	$ 102,066	$ 101,403	$ 40,609