Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value of Financial Instruments [Abstract]

Fair Value Hierarchy

	Fair Value Measurements Using
					Significant
			Quoted Prices in		Other		Significant
			Active Markets for		Observable		Unobservable
	Fair		Identical Assets		Inputs		Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
December 31, 2017
Assets:
Available-for-sale securities	$	3,126		3,126		—		—
Derivatives		12,226		—		12,226		—
Total assets	$	15,352		3,126		12,226		—
Liabilities:
Derivatives	$	23,051		—		23,051		—
Option agreement		23,980		—		—		23,980
Total liabilities	$	47,031		—		23,051		23,980
December 25, 2016
Assets:
Available-for-sale securities	$	3,736		3,736		—		—
Derivatives		87,894		—		87,894		—
Total assets	$	91,630		3,736		87,894		—
Liabilities:
Derivatives	$	11,309		—		11,309		—
Option agreement		28,770		—		—		28,770
Total liabilities	$	40,079		—		11,309		28,770

Reconciliation of Level 3 Fair Value

	2017		2016
Balance at beginning of year	$	(28,770)		(28,360)
Net gains (losses) from change in fair value		4,790		(410)
Balance at end of year	$	(23,980)		(28,770)