Related Party Transactions and Relationships and Transactions With Certain Other Parties (Details 1) (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
Amounts outstanding with the related parties
Purchase of transportation services (a)	$ 413	[1]	$ 1,105	[1]	$ 1,041	[1]	$ 1,666	[1]
Loan guarantee fee (b)	19	[2]	113	[2]	42	[2]	204	[2]
Amounts due from related parties (c)	295	[3]			295	[3]			40	[3]
Amounts due to related parties(d)									$ 479

[1] The Group purchased transportation services of approximately $0.4 million and $1.1 million from Ningbo Xinhe during each of the three months ended June 30, 2013 and 2012.

[2] Guarantees for Bank Loans

[3] Amounts due from related parties consist of the following.