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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Cost and Fair Value of Investments
 
December 31, 2018

December 31, 2017

 
(in thousands)
At start of year

$77,589


$68,046

Purchases
80,956

41,701

Sales and maturities
(99,865
)
(33,086
)
Interest on short term investments
1,329

1,088

Realized gain on sale of short term investments
56

112

Unrealized capital loss – investments
(155
)
(272
)
 
At end of year

$59,910


$77,589
Available For Sale Short Term Investments by Major Security Type
The following table represents our available for sale short term investments by major security type as of December 31, 2018:
 
 
 
 
Maturity by period
 
Cost
Total

Unrealized gains / (losses)

Fair Value
Total

Less than 1
year

1 to 5
years

 
(U.S.$ in millions)
US government debt securities
14.91

(0.07
)
14.84

5.96

8.88

Corporate securities
44.92

(1.19
)
43.73

11.48

32.25

Term deposits
1.34

—

1.34

0.70

0.64

Total (U.S.$ in millions)

$61.17


($1.26
)

$59.91


$18.14


$41.77