Cash and Cash Equivalents and Restricted Cash - Geographic Information (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 04, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 64,308		$ 112,521	$ 98,964	$ 76,174
Restricted Cash [Abstract]
Restricted cash	4,623		0
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	4,722		43,546
Asia [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	50,153		50,799
Europe [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	5,912		12,912
South America [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 3,521		$ 5,264
Surety Bond [Member]
Restricted Cash [Abstract]
Restricted cash		$ 4,623