Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instrument Detail [Abstract]

Estimated Fair Value of Financial Instruments

The following table presents the estimated fair values of our financial instruments:

	March 31, 2021						December 31, 2020
(in thousands)	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Derivative assets related to interest rate swaps (Level 2)	$	67,770		$	67,770		$	18,529		$	18,529
Derivative liabilities related to interest rate swaps (Level 2)	$	(27,212	)	$	(27,212	)	$	(46,110	)	$	(46,110	)
Long-term debt, including current portion (Level 2):
Term loans	$	(690,632	)	$	(712,473	)	$	(690,469	)	$	(716,631	)
Revenue bonds		(65,735	)		(67,957	)		(65,735	)		(67,885	)
Medium-term notes		(3,000	)		(3,143	)		(3,000	)		(3,545	)
Total long-term debt1	$	(759,367	)	$	(783,573	)	$	(759,204	)	$	(788,061	)
Company owned life insurance asset (COLI) (Level 3)	$	3,540		$	3,540		$	3,328		$	3,328

¹ The carrying amount of long-term debt includes principal and unamortized discounts.