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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 735,618	$ 735,618	$ 684,928	$ 787,259
Merger-related adjustments		5,670	0	0
Total other comprehensive income		8,581	7,498	1,061
Ending balance		841,574	735,618	684,928
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Beginning balance	1,197	1,197	(1,678)	(1,570)
Gain (loss) recognized in other comprehensive income (loss), net of tax provision (benefit) of $169, $793 and $(629), respectively		(659)	1,910	(1,457)
(Gain) loss reclassified from accumulated other comprehensive income (loss) to interest expense, net of tax provision (benefit) of $185, $(520) and $(726), respectively (1)		(435)	965	1,349
Merger-related adjustments		5,670	0	0
Total other comprehensive income		4,576	2,875	(108)
Ending balance		5,773	1,197	(1,678)
Gain recognized in other comprehensive income, tax expense (benefit)		169	793	(629)
Gain (loss) reclassified from accumulated other comprehensive loss, tax expense (benefit)		185	(520)	(726)
Adjustment related to TCJA	(300)	(300)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ (41,431)	(41,431)	(34,038)	53,349
Merger-related adjustments		(5,700)
Ending balance		$ 0	$ (41,431)	$ (34,038)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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