Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions - Schedule of accounts receivable, net (Details)

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Composition of Certain Financial Statement Captions - Schedule of accounts receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Accounts receivable, net        
Accounts receivable $ 279,240 $ 219,655    
Allowance for doubtful accounts (2,165) (1,218) $ (1,272) $ (761)
Total accounts receivable, net $ 277,075 $ 218,437