Indebtedness (Tables)

12 Months Ended

Dec. 31, 2012

Indebtedness

Schedule of indebtedness

	As of December 31,
	2012			2011
Senior Notes, due 2012 at 6.85%	$	—		$	100,829
Senior Notes, due 2013 at 6.75%		—			287,000
Senior Notes, due 2014 at 7.875%		300,000			300,000
Senior Notes, due 2015 at 5.125%		280,000			280,000
Senior Notes, due 2016 at 6.3%		275,000			275,000
Senior Notes, due 2017 at 5.625%		300,000			300,000
Senior Notes, due 2018 at 6.7%		350,000			350,000
Senior Notes, due 2022 at 5.0%		500,000			—
Convertible Senior Notes, due 2027 at 3.8%		8,478			79,054
Unamortized discounts		(11,120	)		(5,169	)
Total unsecured senior notes		2,002,358			1,966,714
Unsecured revolving credit facility		320,000			149,000
Unsecured term loan		400,000			—
	$	2,722,358		$	2,115,714

Required principal payments during the next five years and thereafter

2013	$	—
2014		300,000
2015		600,000	(1)
2016		275,000
2017		700,000	(2)
Thereafter		858,478	(3)
	$	2,733,478

(1)

Includes the $320,000 outstanding on our $750,000 revolving credit facility at December 31, 2012.

(2)

Includes our $400,000 unsecured term loan.

(3)

Includes our $8,478 convertible senior notes due 2027. Holders of our convertible senior notes may require us to repurchase all or a portion of the notes on March 15, 2017 and March 15, 2022, or upon the occurrence of certain change in control events.