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Assets Pledged as Collateral or for Security (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Assets Pledged as Collateral or for Security

The following assets were provided as collateral for bank borrowings and the tariff guarantees of imported raw materials:

 

    December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Inventories related to real estate business   $ 4,822,043     $ 4,796,126     $ 156,685  
Investment properties     7,151,382       6,680,017       218,230  
Land use rights (long-term prepayments for lease)     6,813,751       6,515,576       212,858  
Other financial assets (including current and non-current)     66,726       496,902       16,233  
                         
    $ 18,853,902     $ 18,488,621     $ 604,006