Debt (Tables)

12 Months Ended

Dec. 31, 2012

Carrying Value of Debt

The carrying and principal values of debt consist of the following (in thousands):

	Maturity	As of					As of
	Date	December 31, 2012					December 31, 2011
		Carrying Value			Principal Balance		Carrying Value			Principal Balance
1.875% Convertible Senior Notes	May 1, 2013	$	457,351		$	468,836	$	484,970		$	535,000
4.000% Convertible Senior Notes	Oct. 1, 2014		430,751			499,987		397,612			500,000
8.000% Senior Notes	Aug. 15, 2016		—			—		373,198			375,000
8.250% Senior Notes	Aug. 15, 2019		242,205			243,750		372,365			375,000
5.625% Senior Notes	Oct. 1, 2019		500,000			500,000		—			—
5.750% Senior Notes	July 15, 2020		800,000			800,000		—			—
4.254% Secured Tower Revenue Securities Series 2010-1	April 15, 2015		680,000			680,000		680,000			680,000
5.101% Secured Tower Revenue Securities Series 2010-2	April 17, 2017		550,000			550,000		550,000			550,000
2.933% Secured Tower Revenue Securities Series 2012-1	Dec. 15, 2017		610,000			610,000		—			—
Revolving Credit Facility	May 9, 2017		100,000			100,000		—			—
2011 Term Loan B	June 30, 2018		491,518			492,500		496,340			497,500
2012-1 Term Loan A	May 9, 2017		195,000			195,000		—			—
2012-2 Term Loan B	Sept. 28, 2019		299,278			300,000		—			—
Total debt			5,356,103			5,440,073		3,354,485			3,512,500
Less: current maturities of long-term debt			(475,351	)				(5,000	)
Total long-term debt, net of current maturities		$	4,880,752				$	3,349,485

Note Reflected in Long-Term Debt

The Company’s future principal payment obligations (based on the outstanding debt as of December 31, 2012 and assuming the Tower Securities are repaid at their respective ARD dates) are as follows:

	(in thousands)
2013	$	486,836
2014		520,487
2015		705,500
2016		28,000
2017		1,403,000
Thereafter		2,296,250
Total	$	5,440,073

Schedule of Cash and Non-Cash Interest Expense

The table below reflects cash and non-cash interest expense amounts recognized by debt instrument for the years ended December 31, 2012, 2011, and 2010, respectively:

	For the year ended December 31,
	2012					2011					2010
	Cash Interest			Non-cash Interest		Cash Interest			Non-cash Interest		Cash Interest			Non-cash Interest
	(in thousands)
0.375% Convertible Senior Notes	$	—		$	—	$	—		$	—	$	46		$	1,755
1.875% Convertible Senior Notes		9,885			36,388		10,090			33,844		10,313			31,511
4.0% Convertible Senior Notes		20,000			33,149		20,000			29,149		20,000			25,643
8.0% Senior Notes		15,867			174		30,000			309		30,000			285
8.25% Senior Notes		23,177			192		30,938			237		30,938			218
5.625% Senior Notes		7,266			—		—			—		—			—
5.75% Senior Notes		21,594			—		—			—		—			—
CMBS Certificate Series 2006-1		—			—		—			—		16,430			—
2010 Secured Tower Revenue Securities		57,377			—		57,371			—		40,682			—
2012 Secured Tower Revenue Securities		7,133			—		—			—		—			—
Revolving Credit Facility		4,392			—		3,209			—		1,903			—
2011 Term Loan		18,894			179		9,705			90		—			—
2012-1 Term Loan		3,567			—		—			—		—			—
2012-2 Term Loan		2,969			28		—			—		—			—
Mobilitie Bridge Loan		4,239			—		—			—		—			—
Capitalized interest		(319	)		—		(518	)		—		(447	)		—
Other		200			—		101			—		56			658
Total	$	196,241		$	70,110	$	160,896		$	63,629	$	149,921		$	60,070

1.875% Convertible Senior Notes [Member]

Note Reflected in Long-Term Debt

The following table summarizes the balances for the 1.875% Notes:

	As of December 31, 2012			As of December 31, 2011
	(in thousands)
Principal balance	$	468,836		$	535,000
Debt discount		(11,485	)		(50,030	)
Carrying value	$	457,351		$	484,970

4.0% Convertible Senior Notes due 2014[Member]

Note Reflected in Long-Term Debt

The following table summarizes the balances for the 4.0% Notes:

	As of December 31, 2012			As of December 31, 2011
	(in thousands)
Principal balance	$	499,987		$	500,000
Debt discount		(69,236	)		(102,388	)
Carrying value	$	430,751		$	397,612