Notes Payable and Debt and Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Financing structure

The following table presents the Company's outstanding notes payable and debt as of December 31, 2017 and 2016:

(U.S. dollars in thousands)	2017		2016
	Outstanding (1)		Outstanding (1)
Debt Issuance:
$300 million, 2.30% Senior Notes due December 2018	$	299,357	$	298,686
$400 million, 5.75% Senior Notes due October 2021	398,384		397,953
$350 million, 6.375% Senior Notes due November 2024	349,248		349,139
$500 million, 4.45% Subordinated Notes due March 2025	494,138		493,329
$325 million, 6.25% Senior Notes due May 2027	323,531		323,375
$300 million, 5.25% Senior Notes due December 2043	296,560		296,427
$500 million, 5.5% Subordinated Notes due March 2045 (2)	472,832		488,768
€500 million, 3.25% Subordinated Notes due June 2047 (3)	586,719		—
Total debt carrying value	$	3,220,769	$	2,647,677

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(1)    "Outstanding" data represent December 31, 2017 and December 31, 2016 accreted values.

(2) On July 7, 2017, the Company repurchased and canceled $16.7 million of the original debt issuance. See below for further details.

(3) This issuance carried a fixed coupon of 3.25% for a period of ten years, then a floating rate of three-month EURIBOR plus 2.90% from (and including) June 29, 2027 through maturity. The outstanding amount is subject to movement due to foreign exchange.

Credit facilities

The following table presents the Company's ten and nine unsecured LOC facilities and revolving credit facilities at December 31, 2017 and December 31, 2016, respectively:

(U.S. dollars in thousands)	December 31, 2017					December 31, 2016
Facility Name:	Commitment		In Use/ Outstanding			Commitment		In Use/ Outstanding
2015 Citi Facility	$	—	$	—		$	250,000	$	245,000
Goldman Facility	—		—			200,000		200,000
2016 Credit Agricole Facility I	125,000		125,000			125,000		125,000
2016 Credit Agricole Facility II	125,000		125,000			125,000		125,000
2017 Commonwealth Bank Facility	215,000		215,000			—		—
2017 Credit Suisse Facility	100,000		100,000			—		—
FAL Facility I	125,000		125,000			125,000		125,000
FAL Facility II	125,000		125,000			125,000		125,000
FAL Facility III	125,000		125,000			125,000		125,000
FAL Facility IV	125,000		125,000			125,000		125,000
Syndicated Unsecured Facility	750,000		2,000			750,000		—
2017 Commerzbank Facility	100,000		100,000			—		—
Total unsecured LOC facilities	$	1,915,000	$	1,167,000		$	1,950,000	$	1,195,000
Facilities collateralized by certain investment assets	1,477,986		1,382,226			2,041,687		1,150,293
Total LOC facilities	$	3,392,986	$	2,549,226		$	3,991,687	$	2,345,293
Percentage of facilities collateralized by certain investment assets			54.2		%			48.6		%