Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value

	Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	—	$	4,153	$	—	$	4,153
Long-term derivative asset (1)		—		16		—		16
Total derivative instruments	$	—	$	4,169	$	—	$	4,169
Liabilities:
Current derivative liability (2)	$	—	$	22	$	—	$	22
Long-term derivative liability (3)		—		15		—		15
Total derivative instruments	$	—	$	37	$	—	$	37

⁽¹⁾ Included in other assets in the Consolidated Balance Sheet

⁽²⁾ Included in accrued liabilities in the Consolidated Balance Sheet

⁽³⁾ Included in other long-term obligations in the Consolidated Balance Sheet

Carrying Values and Estimated Fair Values of Financial Instruments

	September 30, 2017				December 31, 2016 (1)
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Term loan, secured due April 2024	$	975,000	$	975,000	$	—	$	—
6.875% Notes, unsecured, due April 2022, issued 2017		700,000		713,790		—		—
7.125% Notes, unsecured, due April 2025, issued 2017		500,000		505,000		—		—
Credit Facility, secured due January 2022		20,000		20,000		—		—
7.31% Notes due March 2016, issued 2009		—		—		62,000		64,266
4.98% Notes due January 2017, issued 2010		—		—		116,000		123,967
5.92% Notes due March 2018, issued 2008		—		—		200,000		224,025
5.75% Notes due December 2018, issued 2013		—		—		450,000		465,630
7.77% Notes due March 2019, issued 2009		—		—		173,000		204,854
5.50% Notes due January 2020, issued 2010		—		—		207,000		233,932
4.51% Notes due October 2020, issued 2010		—		—		315,000		337,528
5.60% Notes due January 2022, issued 2010		—		—		87,000		99,983
4.66% Notes due October 2022, issued 2010		—		—		35,000		38,225
6.125% Notes due October 2024, issued 2014		—		—		850,000		893,325
5.85% Notes due January 2025, issued 2010		—		—		90,000		106,299
4.91% Notes due October 2025, issued 2010		—		—		175,000		193,665
Credit Facility due October 2016		—		—		999,000		999,000
	$	2,195,000	$	2,213,790	$	3,759,000	$	3,984,699

⁽¹⁾ At December 31, 2016, the debt included in the table above is a component of liabilities subject to compromise in our Consolidated Balance Sheets. See Note 1.