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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Values and Related Notional Values of Derivatives [Table Text Block]
The net fair values and the related net notional values of derivatives included in the Company’s Consolidated Balance Sheets at December 31, 2016 and 2015 were as follows (in thousands of U.S. dollars):
 
 
Asset
derivatives
at fair value

Liability
derivatives
at fair value

Net derivatives
December 31, 2016
 
Net notional
exposure

Fair value
Derivatives not designated as hedges
 
 
 
 
 
 
 
 
Foreign exchange forward contracts
 
$
5,263

 
$
(7,142
)
 
$
1,929,033

 
$
(1,879
)
Insurance-linked securities (1)
 
10,130

 
(97
)
 
145,011

 
10,033

Total return swaps
 
1,989

 
(3,217
)
 
42,304

 
(1,228
)
Interest rate swaps (2)
 
—

 
(13,403
)
 
194,585

 
(13,403
)
TBAs
 
1,369

 
(185
)
 
386,500

 
1,184

Total derivatives not designated as hedges
 
$
18,751

 
$
(24,044
)
 
 
 
$
(5,293
)
 
 
 
 
 
 
 
 
 
Total derivatives
 
$
18,751

 
$
(24,044
)
 
 
 
$
(5,293
)
 
 
 
Asset
derivatives
at fair value
 
Liability
derivatives
at fair value
 
Net derivatives
December 31, 2015
 
Net notional
exposure
 
Fair value
Derivatives designated as hedges
 
 
 
 
 
 
 
 
Foreign exchange forward contracts (net investment hedge)
 
$
—

 
$
(9,305
)
 
$
392,523

 
$
(9,305
)
Total derivatives designated as hedges
 
$
—

 
$
(9,305
)
 
 
 
$
(9,305
)
 
 
 
 
 
 
 
 
 
Derivatives not designated as hedges
 
 
 
 
 
 
 
 
Foreign exchange forward contracts
 
$
15,311

 
$
(5,804
)
 
$
1,708,285

 
$
9,507

Foreign currency option contracts
 
—

 
—

 
82,148

 
—

Futures contracts
 
5,675

 
(140
)
 
3,610,658

 
5,535

Insurance-linked securities (1)
 
9,428

 
(3,944
)
 
140,320

 
5,484

Total return swaps
 
2,745

 
(2,878
)
 
42,438

 
(133
)
Interest rate swaps (2)
 
—

 
(24,383
)
 
196,804

 
(24,383
)
TBAs
 
—

 
(1,462
)
 
447,315

 
(1,462
)
Total derivatives not designated as hedges
 
$
33,159

 
$
(38,611
)
 
 
 
$
(5,452
)
 
 
 
 
 
 
 
 
 
Total derivatives
 
$
33,159

 
$
(47,916
)
 
 
 
$
(14,757
)

 
 
(1)
At December 31, 2016 and 2015, insurance-linked securities include a longevity swap for which the notional amount is not reflective of the overall potential exposure of the swap. As such, the Company has included the probable maximum loss under the swap within the net notional exposure as an approximation of the notional amount.
(2)
The Company enters into interest rate swaps to mitigate notional exposures on certain total return swaps and certain fixed maturities. Only the notional value of interest rate swaps on fixed maturities is presented separately in the table.
Gains and Losses on Derivatives not Designated as Hedges [Table Text Block]
The gains and losses in the Consolidated Statements of Operations for derivatives not designated as hedges for the years ended December 31, 2016, 2015 and 2014 were as follows (in thousands of U.S. dollars):

2016
 
2015
 
2014
Foreign exchange forward contracts
$
(53,437
)
 
$
(29,217
)
 
$
39,399

Foreign currency option contracts
2,583

 
(3,472
)
 
(810
)
Total included in net foreign exchange (losses) gains
$
(50,854
)
 
$
(32,689
)
 
$
38,589

Futures contracts
$
(5,195
)
 
$
(32,004
)
 
$
(72,146
)
Insurance-linked securities
3,813

 
(1,556
)
 
230

Total return swaps
(1,096
)
 
1,390

 
(1,002
)
Interest rate swaps
10,981

 
(8,101
)
 
(15,871
)
TBAs
6,366

 
2,877

 
13,166

Other
—

 
2,493

 
(3
)
Total included in net realized and unrealized investment gains (losses)
$
14,869

 
$
(34,901
)
 
$
(75,626
)
Total derivatives not designated as hedges
$
(35,985
)
 
$
(67,590
)
 
$
(37,037
)
Offsetting Disclosures [Table Text Block]
The gross and net fair values of derivatives that are subject to offsetting in the Consolidated Balance Sheets at December 31, 2016 and 2015 were as follows (in thousands of U.S. dollars):
 
 
 
 
Gross
amounts
offset in the
balance sheet
 
Net amounts of
assets/liabilities
presented in the
balance sheet
 
Gross amounts not offset
in the balance sheet
 
 
December 31, 2016
 
Gross
amounts
recognized (1)
 
Financial
instruments
 
Cash collateral
received/pledged
 
Net amount
Total derivative assets
 
$
18,751

 
$
—

 
$
18,751

 
$
(794
)
 
$
(34,120
)
 
$
(16,163
)
Total derivative liabilities
 
$
(24,044
)
 
$
—

 
$
(24,044
)
 
$
794

 
$
22,923

 
$
(327
)
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Total derivative assets
 
$
33,159

 
$
—

 
$
33,159

 
$
(1,037
)
 
$
(10,222
)
 
$
21,900

Total derivative liabilities
 
$
(47,916
)
 
$
—

 
$
(47,916
)
 
$
1,037

 
$
25,904

 
$
(20,975
)
 
 
(1)
Amounts include all derivative instruments, irrespective of whether there is a legally enforceable master netting arrangement in place.