Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value

	Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	—	$	14,480	$	—	$	14,480
Long-term derivative asset (1)		—		3,692		—		3,692
Total derivative instruments	$	—	$	18,172	$	—	$	18,172
Liabilities:
Current derivative liability	$	—	$	54,891	$	—	$	54,891
Long-term derivative liability (2)		—		7,853		—		7,853
Total derivative instruments	$	—	$	62,744	$	—	$	62,744

⁽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

	June 30, 2018				December 31, 2017
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Term loan, secured, due April 2024	$	972,563	$	889,895	$	975,000	$	975,000
6.875% Notes, unsecured, due April 2022, issued 2017		700,000		530,432		700,000		701,750
7.125% Notes, unsecured, due April 2025, issued 2017		500,000		351,250		500,000		505,000
Credit Facility, secured, due January 2022		58,000		58,000		—		—
Long-term debt	$	2,230,563	$	1,829,577	$	2,175,000	$	2,181,750