Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Change in goodwill

	2017		2016
Goodwill, balance at January 1,	$	785,399	$	757,142
Change in goodwill	3,659		28,257
Goodwill, balance at December 31,	$	789,058	$	785,399

Amortizable intangibles

	Cost of Amortizable Intangibles				Accumulated Amortization (Expense) Benefit						Net Amortizable Intangibles
	December 31, 2017		December 31, 2016		December 31, 2017			December 31, 2016			December 31, 2017		December 31, 2016
Amortizable intangible assets:
Favorable leases	$	22,500	$	27,960	$	(14,495	)	$	(18,104	)	$	8,005	$	9,856
Non-compete agreements	1,851		1,887		(464		)	(414		)	1,387		1,473
Total amortizable intangible assets	$	24,351	$	29,847	$	(14,959	)	$	(18,518	)	$	9,392	$	11,329
Unfavorable leases	$	14,470	$	19,950	$	11,853		$	15,840		$	2,617	$	4,110

Estimated net amortization of intangibles

	December 31, 2017
	Amortization Expense			Amortization Benefit		Total Amortization Expense
2018	$	(1,622	)	$	923	$	(699	)
2019	(1,405		)	713		(692		)
2020	(1,228		)	541		(687		)
2021	(1,001		)	389		(612		)
2022	(883		)	51		(832		)
Total	$	(6,139	)	$	2,617	$	(3,522	)