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Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Financial assets measured at fair value through profit or loss $ 0 $ 521 $ 5,017
Measured at amortized cost:      
Cash and cash equivalents 106,437 138,023 184,452
Financial asset at amortized cost 11,229 10,358 5,140
Accounts receivable and other receivables (including related parties) 189,279 188,774 192,534
Restricted deposit (including current and noncurrent) 164,326 147,000 138,200
Total 488,013 516,001 550,937
Financial assets at fair value through profit or loss, category [member]      
Financial assets measured at fair value through profit or loss 9,768 2,121 15,579
Financial assets at fair value through other comprehensive income, category [member]      
Financial assets measured at fair value through other comprehensive income 791 1,522 1,680
Financial assets at amortised cost, category [member]      
Measured at amortized cost:      
Cash and cash equivalents 106,437 138,023 184,452
Financial asset at amortized cost 11,229 10,358 5,140
Accounts receivable and other receivables (including related parties) 194,021 215,070 204,543
Restricted deposit (including current and noncurrent) 164,456 147,470 138,324
Refundable deposits 1,311 1,437 1,219
Subtotal $ 477,454 $ 512,358 $ 533,678