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Reportable Operating Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Revenues and total assets by geographic area
Revenues	$ 445,013	$ 337,436	$ 855,008	$ 629,009
% of revenue	100.00%	100.00%	100.00%	100.00%
Total Assets	925,085		925,085		931,207
United States
Revenues and total assets by geographic area
Revenues			845,461	624,293
% of revenue			98.90%	99.30%
Total Assets	914,123		914,123		920,872
Non-United States
Revenues and total assets by geographic area
Revenues			9,547	4,716
% of revenue			1.10%	0.70%
Total Assets	$ 10,962		$ 10,962		$ 10,335

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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