Debt Arrangements (Tables)

3 Months Ended

Mar. 31, 2015

Net Carrying Amount of Debt

The Company’s net carrying amount of debt is comprised of the following:

	March 31, 2015		December 31, 2014
Senior Secured Notes	$	758,750	$	774,030
1.50% Convertible Notes		344,113		339,943
2.50% Convertible Notes		283,449		280,104
Variable Funding Note		100,000		—
Total	$	1,486,312	$	1,394,077

Company's Debt Maturities on Calendar Year Basis

As of March 31, 2015, the Company’s debt maturities on a calendar year basis are as follows:

	Total		April 1 through December 31, 2015		2016		2017		2018		2019		Thereafter
Senior Secured Notes	$	758,750	$	45,843	$	61,123	$	61,123	$	61,123	$	61,123	$	468,415
1.50% Convertible Notes (1)		344,113		—		—		—		344,113				—
2.50% Convertible Notes (2)		283,449		—		283,449		—		—		—		—
Variable Funding Notes		100,000								100,000
Total	$	1,486,312	$	45,843	$	344,572	$	61,123	$	505,236	$	61,123	$	468,415

⁽¹⁾  Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of March 31, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 1.50% Convertible Notes is $400.0 million.

⁽²⁾  Reflects the net debt carrying amount of the 2.50% Convertible Notes in the consolidated balance sheet as of March 31, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 2.50% Convertible Notes is $300.0 million.

1.50% Convertible Notes

Details of Convertible Notes Reflected on Consolidated Balance Sheet

As of March 31, 2015 and December 31, 2014, the amount of the 1.50% Convertible Notes accounted for as a liability was approximately $344.1 million and $339.9 million, respectively, and is reflected on the consolidated balance sheet as follows:

	March 31, 2015		December 31, 2014
Equity component carrying amount	$	49,931	$	49,931
Unamortized discount		55,887		60,057
Net debt carrying amount		344,113		339,943

2.50% Convertible Notes

Details of Convertible Notes Reflected on Consolidated Balance Sheet

As of March 31, 2015 and December 31, 2014, the amount of the 2.50% Convertible Notes accounted for as a liability was approximately $283.4 million and $280.1 million, respectively, and is reflected on the consolidated balance sheet as follows:

	March 31, 2015		December 31, 2014
Equity component carrying amount	$	35,996	$	35,996
Unamortized discount		16,551		19,896
Net debt carrying amount		283,449		280,104