Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Maturities of Long-term Debt

At December 31, 2018, aggregate principal repayments of total debt for the next five years and thereafter are as follows:

2019		2020		2021		2022		2023		Thereafter		Total
$	—	$	65,890	$	96,142	$	99,481	$	—	$	3,673,040	$	3,934,553

Schedule of Debt

The following table presents the carrying value, net of unamortized debt issuance costs and discounts, and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively:

	December 31, 2018				December 31, 2017
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Senior unsecured notes
5.75% Senior Notes due March 2018	$	—	$	—	$	249,843	$	250,830
7.50% Senior Notes due March 2019	—		—		201,535		206,881
4.90% Senior Notes due August 2020	65,810		60,177		167,422		163,283
4.625% Senior Notes due March 2021	92,967		84,931		208,095		195,687
3.95% Senior Notes due March 2022	41,617		37,096		125,307		107,348
7.75% Senior Notes due January 2024	783,350		613,719		971,498		861,160
7.95% Senior Notes due April 2025	446,517		339,035		446,106		380,732
7.875% Senior Notes due February 2026	738,075		647,085		—		—
6.20% Senior Notes due August 2040	390,454		245,242		396,738		274,988
6.05% Senior Notes due March 2041	389,693		247,171		394,514		273,988
5.25% Senior Notes due March 2042	477,996		277,056		494,063		315,430
8.95% Senior Notes due April 2045	390,672		311,392		390,589		320,396
Other:
Seller-financed secured loan due September 2022	60,251		57,902		—		—
Total debt	3,877,402		2,920,806		4,045,710		3,350,723
Less: Current maturities of long-term debt	—		—		249,843		250,830
Long-term debt	$	3,877,402	$	2,920,806	$	3,795,867	$	3,099,893