Miscellaneous Income, Net (Tables)

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Schedule of miscellaneous income, net

	Years ended December 31,
	2017		2016	2015
Gains on sales of operating property and equipment	$	26,093	2,475	3,045
Insurance proceeds/recoveries	1,734		966	—
Contract settlement	1,600		—	55
Foreign currency transaction gains	657		1,236	1,945
Rabbi trust investment income	10,522		2,763	632
Other, net	3,639		5,628	4,479
Total	$	44,245	13,068	10,156