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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Secured borrowings [1] $ 164,000 $ 147,000 $ 138,000
Unused credit lines 247,295 238,695 285,511
Short-term borrowings [member]      
Unsecured borrowings 20,000 0 0
Secured borrowings $ 164,000 $ 147,000 $ 138,000
Short-term borrowings [member] | Bottom of range [member]      
Interest rate 0.35% 0.35% 0.32%
Short-term borrowings [member] | Top of range [member]      
Interest rate 2.96% 0.58% 0.55%
[1] The pledged assets are booked as restricted deposits and classified as current or noncurrent by its liquidity.