Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid accounts	$ 12,532	$ 16,891
Various insurance and workers’ compensation receivables	9,595	12,040
Inventory and supplies	7,875	10,396
Income taxes receivable	6,978	950
Other receivables	6,287	2,338
Deferred financing costs	5,437	1,374
Marketable securities - (Deferred compensation plan)	3,072	2,483
Straight-line rent	2,483	2,194
Fair value of derivatives	2,283	0
Utility, workers’ compensation escrow and lease deposits	1,726	1,851
Deferred tax assets	391	553
Deferred IPO costs	0	8,217
Other assets	$ 58,659	$ 59,287