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Foreign Currency Gain (Loss), Net	12 Months Ended
Foreign Currency Gain (Loss), Net	Dec. 31, 2017
Foreign Currency [Abstract]
Foreign Currency Gain (Loss), Net	16. Foreign Currency Gain (Loss), Net Net foreign currency gain or loss includes non-cash translation gain or loss associated with intercompany balances. A substantial portion of the Company’s net foreign currency gain or loss is non-cash translation gain or loss associated with intercompany long-term loans to our Korean subsidiary. The loans are denominated in U.S. dollars and are affected by changes in the exchange rate between the Korean won and the U.S. dollar. As of December 31, 2017, 2016 and 2015, the outstanding intercompany loan balances including accrued interest between the Korean subsidiary and the Dutch subsidiary were $677,267 thousand, $598,212 thousand and $591,388 thousand, respectively. The Korean won to U.S. dollar exchange rates were 1,071.4:1, 1,208.5:1 and 1,172.0:1 using the first base rate as of December 31, 2017, 2016 and 2015, respectively, as quoted by the KEB Hana Bank.