Long-term Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Current assets	$ 522,625us-gaap_AssetsCurrent	$ 470,407us-gaap_AssetsCurrent
Total assets	629,161us-gaap_Assets	565,607us-gaap_Assets
Liabilities and shareholders' equity:
Current liabilities	324,515us-gaap_LiabilitiesCurrent	291,072us-gaap_LiabilitiesCurrent
Shareholders' equity	289,257us-gaap_StockholdersEquity	226,700us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	629,161	565,607
Beijing Henglong [Member]
Assets:
Current assets	15,171	13,364
Other assets	7,908	6,510
Total assets	23,079	19,874
Liabilities and shareholders' equity:
Current liabilities	12,853	9,109
Other liabilities	2,886	2,897
Shareholders' equity	7,340	7,868
Total liabilities and shareholders' equity	$ 23,079	$ 19,874

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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