Related Party Transactions and Relationships and Transactions With Certain Other Parties (Details 5) (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
Transactions and amounts outstanding with certain other parties
Loan guarantee fee (b)	$ 19	[1]	$ 113	[1]	$ 42	[1]	$ 204	[1]
Amounts due to related parties(d)									479
Amounts due from related parties (c)	295	[2]			295	[2]			40	[2]
Certain Other Parties [Member]
Transactions and amounts outstanding with certain other parties
Sales of products (e)	8,809	[3]	47,734	[3]	50,129	[3]	70,021	[3]
Purchase of raw materials (f)	7,987	[4]	21,942	[4]	34,703	[4]	22,358	[4]
Guarantee for bank borrowings (g)	94,405	[1]	141,062	[1]	94,405	[1]	161,688	[1]
Loan guarantee fee (b)	575	[1]	382	[1]	1,092	[1]	742	[1]
Amounts due to related parties(d)	953	[5]			953	[5]				[5]
Amounts due from related parties (c)	$ 23,614	[6]			$ 23,614	[6]			$ 28,028	[6]

[1] Guarantees for Bank Loans

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

[3] The Group sold finished products of approximately $1.8 million and $7 million to Ningbo Litong during the three months ended June 30, 2013 and 2012, respectively and sold finished products of approximately $7.0 million and $41 million to Ningbo Kunde during the three months ended June 30, 2013 and 2012, respectively. The Group sold finished products of approximately $12.1 million and $17 million to Ningbo Litong, during the six months ended June 30, 2013 and 2012, respectively. The Group sold finished products of approximately $38.0 million and $53 million to Kunde during the six months ended June 30, 2013 and 2012, respectively.

[4] During the three months ended June 30, 2013, the Group purchased raw materials of nil and approximately $8.0 million from Kunde and Kewei, respectively. During the three months ended June 30, 2012, the Group purchased raw material of $8.8 million and $13.1 million from Ningbo Litong and Ningbo Kunde, respectively. During the six months ended June 30, 2013, the Group purchased raw materials of approximately $2.7 million and $32.0 million from Kunde and Kewei, respectively. During the six months ended June 30, 2012, the Group purchased raw materials of approximately $9.2 million and $13.1 million from Ningbo Litong and Ningbo Kunde, respectively.

[5] At June 30, 2013, amounts due to certain other parties consist of amounts due to Kewei of approximately $1.0 million.

[6] At June 30, 3013, amounts due from certain other parties consist of amounts due from Litong, Kunde and Kewei of $2.6 million, $4.3 million and $16.7 million, respectively. These amounts are included in accounts receivable and prepayments to suppliers on the consolidated balance sheet.