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Reportable Operating Segments (Details 2) (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
Revenues and total assets by geographic area
Revenues	$ 480,883	$ 431,842	$ 337,436	$ 291,573	$ 373,066	$ 375,483	$ 351,956	$ 359,645	$ 1,541,734	$ 1,460,150	$ 941,765
% of revenue									100.00%	100.00%	100.00%
Total Assets	931,207				728,413				931,207	728,413
United States
Revenues and total assets by geographic area
Revenues									1,530,819	1,447,863	920,051
% of revenue									99.30%	99.20%	97.70%
Total Assets	920,872				719,028				920,872	719,028
Non-United States
Revenues and total assets by geographic area
Revenues									10,915	12,287	21,714
% of revenue									0.70%	0.80%	2.30%
Total Assets	$ 10,335				$ 9,385				$ 10,335	$ 9,385

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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