Debt Arrangements (Tables)

12 Months Ended

Dec. 31, 2014

Net Carrying Amount of Debt

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

	December 31,
	2014		2013
Senior Secured Notes	$	774,030	$	836,888
1.50% Convertible Notes		339,943		323,418
2.50% Convertible Notes		280,104		267,013
Total	$	1,394,077	$	1,427,319

Company's Debt Maturities on Calendar Year Basis

As of December 31, 2014, the Company’s debt maturities on a calendar year basis are as follows:

	Total		2015		2016		2017		2018		2019		Thereafter
Senior Secured Notes	$	774,030	$	61,123	$	61,123	$	61,123	$	61,123	$	61,123	$	468,415
1.50% Convertible Notes(1)		339,943		—		—		—		339,943		—		—
2.50% Convertible Notes(2)		280,104		—		280,104		—		—		—		—
Total	$	1,394,077	$	61,123	$	341,227	$	61,123	$	401,066	$	61,123	$	468,415

(1) Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of December 31, 2014, 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 December 31, 2014, 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 December 31, 2014 and December 31, 2013 the amount of the 1.50% Convertible Notes accounted for as a liability was approximately $339.9 million and $323.4 million, respectively, and is reflected on the consolidated balance sheet as follows:

	December 31,
	2014		2013
Equity component carrying amount	$	49,931	$	49,931
Unamortized discount		60,057		76,582
Net debt carrying amount	$	339,943	$	323,418

2.50% Convertible Notes

Details of Convertible Notes Reflected on Consolidated Balance Sheet

As of December 31, 2014 and December 31, 2013, the amount of the 2.50% Convertible Notes accounted for as a liability was approximately $280.1 million and $267.0 million, respectively, and is reflected on the consolidated balance sheet as follows:

	December 31,
	2014		2013
Equity component carrying amount	$	35,996	$	35,996
Unamortized discount		19,896		32,987
Net debt carrying amount	$	280,104	$	267,013