Income Taxes Provision for Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal									$ 0	$ 179	$ 0
State taxes									281	943	1,473
Foreign taxes									11,890	7,586	267
Total current									12,171	8,708	1,740
Deferred:
Federal									10,085	0	0
State taxes									(196)	0	0
Total deferred									9,889	0	0
(Provision) benefit for income taxes	$ 5,757	$ (1,938)	$ 3,494	$ 14,747	$ (635)	$ 1,889	$ 306	$ 7,148	$ 22,060	$ 8,708	$ 1,740