Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value

	Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	—	$	25,118	$	—	$	25,118
Long-term derivative asset (1)		—		7,697		—		7,697
Total derivative instruments	$	—	$	32,815	$	—	$	32,815
Liabilities:
Current derivative liability	$	—	$	21,036	$	—	$	21,036
Long-term derivative liability (2)		—		2,418		—		2,418
Total derivative instruments	$	—	$	23,454	$	—	$	23,454

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

⁽²⁾ Included in other long-term obligations in the Consolidated Balance Sheet.

Carrying Values and Estimated Fair Values of Financial Instruments

	March 31, 2018				December 31, 2017
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Term loan, secured, due April 2024	$	975,000	$	972,563	$	975,000	$	975,000
6.875% Notes, unsecured, due April 2022, issued 2017		700,000		610,316		700,000		701,750
7.125% Notes, unsecured, due April 2025, issued 2017		500,000		410,000		500,000		505,000
Credit Facility, secured, due January 2022		—		—		—		—
	$	2,175,000	$	1,992,879	$	2,175,000	$	2,181,750