Debt and Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of financing structure

The following table shows the Company’s financing structure:

	Outstanding(1)		Balance(2)
December 31, 2014
2006 Senior notes due 2016	$	500,000	$	499,690
2010 Senior notes due 2020	300,000		299,112
Swiss office building mortgage	14,157		14,157
Swiss office building credit facility	5,056		5,056
$1,000,000 Secured letter of credit facility — uncommitted	497,332		—
$150,000 Secured letter of credit facility — committed (3)	—		—
	$	1,316,545	$	818,015
December 31, 2013
2006 Senior notes due 2016	$	500,000	$	499,512
2010 Senior notes due 2020	300,000		298,987
$1,000,000 Secured letter of credit facility — uncommitted	707,915		—
$450,000 Secured letter of credit facility — committed	86,102		—
	$	1,594,017	$	798,499

(1) Indicates utilization of commitment amount, not drawn borrowings.

(2) Represents the principal amount borrowed, net of unamortized discount.

(3) The commitment was reduced from $450,000 to $150,000 during 2014.

Schedule of debt maturities

The following table reflects the Company’s debt maturities, which includes its senior notes and other long-term debt:

	Amount
2015	$	228
2016	500,303
2017	5,359
2018	303
2019	303
2020 and thereafter	312,717
Total	$	819,213