Segment and Geographic Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended			15 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Sep. 30, 2012
Summary of net revenues by geographic area
Revenues	$ 173,070	$ 136,323	$ 105,214	$ 111,710	$ 88,532	$ 90,552	$ 526,317	$ 454,621	$ 444,322	$ 159,883	$ 115,654
North America [Member]
Summary of net revenues by geographic area
Revenues							164,157	155,877	177,480
Europe [Member]
Summary of net revenues by geographic area
Revenues							200,589	160,230	136,846
Asia Pacific [Member]
Summary of net revenues by geographic area
Revenues							55,028	78,777	51,496
Latin America [Member]
Summary of net revenues by geographic area
Revenues							46,212	12,199	45,954
Africa [Member]
Summary of net revenues by geographic area
Revenues							18,469	7,926	18,417
Middle East [Member]
Summary of net revenues by geographic area
Revenues							37,471	28,227	10,536
Commonwealth of Independent States [Member]
Summary of net revenues by geographic area
Revenues							$ 4,391	$ 11,385	$ 3,593