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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Accounts receivable from related party $ 4,455 $ 5,033
Accrued liabilities to related parties $ 2,045 $ 4,594
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 125,000,000 125,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 225,000,000 225,000,000
Common stock, shares issued 61,985,000 59,046,000
Common stock, shares outstanding 61,985,000 59,046,000