Our obligations under debt arrangements consisted of the following:



	March 31, 2019						December 31, 2018
	Principal		Unamortized Discount and Debt Issuance Costs ⁽¹⁾		Net Value		Principal		Unamortized Discount and Debt Issuance Costs ⁽¹⁾		Net Value
Senior secured credit facility	$	942,000	$	—	$	942,000	$	970,100	$	—	$	970,100
6.750% senior unsecured notes	750,000		11,919		738,081		750,000		12,763		737,237
6.000% senior unsecured notes	400,000		4,357		395,643		400,000		4,624		395,376
5.625% senior unsecured notes	350,000		4,596		345,404		350,000		4,820		345,180
6.500% senior unsecured notes	550,000		7,936		542,064		550,000		8,241		541,759
6.250% senior unsecured notes	450,000		6,945		443,055		450,000		7,189		442,811
Total long-term debt	$	3,442,000	$	35,753	$	3,406,247	$	3,470,100	$	37,637	$	3,432,463


(1)	Unamortized debt issuance costs associated with our senior secured credit facility (included in Other Long Term Assets on the Unaudited Condensed Consolidated Balance Sheet) were $10.0 million and $10.8 million as of March 31, 2019 and December 31, 2018, respectively.