At June 30, 2021 and December 31, 2020, both Maiden Holdings and its wholly owned subsidiary, Maiden NA, had outstanding publicly-traded senior notes which were issued in 2016 ("2016 Senior Notes") and 2013 ("2013 Senior Notes"), respectively (collectively "Senior Notes"). The 2013 Senior Notes issued by Maiden NA are fully and unconditionally guaranteed by Maiden Holdings. The Senior Notes are unsecured and unsubordinated obligations of the Company.


June 30, 2021	2016 Senior Notes			2013 Senior Notes			Total
Principal amount	$	110,000		$	152,500		$	262,500
Less: unamortized issuance costs	3,489			3,775			7,264
Carrying value	$	106,511		$	148,725		$	255,236

December 31, 2020	2016 Senior Notes			2013 Senior Notes			Total
Principal amount	$	110,000		$	152,500		$	262,500
Less: unamortized issuance costs	3,516			3,858			7,374
Carrying value	$	106,484		$	148,642		$	255,126

Other details:
Original debt issuance costs	$	3,715		$	5,054
Maturity date	June 14, 2046			December 1, 2043
Earliest redeemable date (for cash)	June 14, 2021			December 1, 2018
Coupon rate	6.625		%	7.75		%
Effective interest rate	7.07		%	8.04		%

The interest expense incurred on the Senior Notes for the three and six months ended June 30, 2021 was $4,776 and $9,553, respectively (2020 - $4,776 and $9,553, respectively), of which $1,342 was accrued at both June 30, 2021 and December 31, 2020, respectively. The issuance costs related to the Senior Notes were capitalized and are being amortized over the effective life of the Senior Notes. The amortization expense for the three and six months ended June 30, 2021 was $56 and $110, respectively (2020 - $54 and $108, respectively).

Under the terms of the 2013 Senior Notes, the 2013 Senior Notes can be redeemed, in whole or in part, at Maiden NA's option at any time and from time to time, until maturity at a redemption price equal to 100% of the principal amount of the notes to be redeemed plus accrued but unpaid interest on the principal amount being redeemed to, but not including, the redemption date. Maiden NA is required to give at least thirty days and not more than sixty days notice prior to the redemption date.

Under the terms of the 2016 Senior Notes, the 2016 Senior Notes can be redeemed, in whole or in part, at Maiden Holdings' option at any time and from time to time, until maturity at a redemption price equal to 100% of the principal amount of the notes to be redeemed plus accrued but unpaid interest on the principal amount being redeemed to, but not including, the redemption date. Maiden Holdings is required to give at least thirty days and not more than sixty days notice prior to the redemption date.