Goodwill and Intangible Assets, net (Schedule of Intangible Assets Estimated Useful Lives) (Details) (USD $) In Thousands, unless otherwise specified						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer Lists and Relationships [Member]	Dec. 31, 2012 Non-compete Agreements [Member]	Dec. 31, 2012 Other [Member]	Dec. 31, 2012 Weighted Average [Member]	Dec. 31, 2012 Weighted Average [Member] Customer Lists and Relationships [Member]	Dec. 31, 2012 Weighted Average [Member] Non-compete Agreements [Member]	Dec. 31, 2012 Weighted Average [Member] Other [Member]
Intangible assets remaining amortization, Weighted Average Remaining Years						3 years 7 months 6 days	3 years 8 months 12 days	4 years 4 months 24 days	2 years 8 months 12 days
Intangible assets remaining amortization, Amount	$ 16,123	$ 16,825	$ 12,329	$ 1,615	$ 2,179