Indebtedness (Tables)

12 Months Ended

Dec. 31, 2012

Indebtedness

Schedule of outstanding indebtedness

	December 31,
	2012		2011
Unsecured revolving credit facility, due October 2015, at LIBOR plus a premium	$	297,000	$	100,000
Unsecured revolving credit facility, due March 2016, at LIBOR plus a premium		95,000		—
Unsecured term loan, due December 2012, at LIBOR plus a premium		—		57,000
Unsecured term loan, due December 2016, at LIBOR plus a premium		500,000		500,000
Unsecured term loan, due July 2017, at LIBOR plus a premium		350,000		—
Senior Notes, due 2012 at 6.95%		—		150,680
Senior Notes, due 2013 at 6.50%		—		190,980
Senior Notes, due 2014 at 5.75%		244,655		244,655
Senior Notes, due 2015 at 6.40%		186,000		186,000
Senior Notes, due 2015 at 5.75%		250,000		250,000
Senior Notes, due 2016 at 6.25%		400,000		400,000
Senior Notes, due 2017 at 6.25%		250,000		250,000
Senior Notes, due 2018 at 6.65%		250,000		250,000
Senior Notes, due 2019 at 7.50%		125,000		125,000
Senior Notes, due 2020 at 5.875%		250,000		250,000
Senior Notes, due 2042 at 5.75%		175,000		—
Mortgage Notes Payable, due 2012 at 7.31%		—		5,428
Mortgage Notes Payable, due 2012 at 6.0%		—		4,633
Mortgage Notes Payable, due 2014 at 4.95%		12,356		12,655
Mortgage Notes Payable, due 2015 at 5.99%		8,272		8,540
Mortgage Notes Payable, due 2015 at 5.78%		8,980		9,256
Mortgage Notes Payable, due 2016 at 5.235%		116,000		—
Mortgage Notes Payable, due 2016 at 5.689%		7,500		—
Mortgage Notes Payable, due 2016 at 5.76%		7,474		7,833
Mortgage Notes Payable, due 2016 at 6.03%		40,854		41,335
Mortgage Notes Payable, due 2016 at 6.29%		146,264		—
Mortgage Notes Payable, due 2016 at 7.36%		11,302		11,766
Mortgage Notes Payable, due 2017 at 5.67%		41,275		41,275
Mortgage Notes Payable, due 2017 at 5.68%		265,000		265,000
Mortgage Notes Payable, due 2017 at 5.95%		18,447		—
Mortgage Notes Payable, due 2019 at LIBOR plus a premium(1)		174,870		175,000
Mortgage Notes Payable, due 2021 at 5.69%		28,793		—
Mortgage Notes Payable, due 2021 at 5.30%		40,185		—
Mortgage Notes Payable, due 2022 at 6.75%		3,759		4,042
Mortgage Notes Payable, due 2023 at 6.14%		12,650		13,530
Mortgage Notes Payable, due 2026 at 5.71%		7,637		8,012
Mortgage Notes Payable, due 2027 at 6.06%		—		12,924
		4,324,273		3,575,544
Unamortized net premiums and discounts		25,548		1,787
	$	4,349,821	$	3,577,331

⁽¹⁾

Interest on this loan is payable at a spread over LIBOR but has been fixed for the first seven years to 2016 by a cash flow hedge which sets the rate at approximately 5.66%.

Schedule of required principal payments on outstanding debt

The required principal payments due during the next five years and thereafter under all of our and SIR's outstanding debt at December 31, 2012, are as follows:

2013	$	8,408
2014		265,411
2015		757,649
2016		1,319,736
2017		929,271
Thereafter		1,043,798
	$	4,324,273