Commitments, Contingencies and Guarantees (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Leases: Minimum rental commitments and minimum royalty requirements under all noncancellable operating leases, primarily quarry property, in effect at December 31, 2017 were (in thousands):

Years Ending December 31,
2018	$	12,169
2019	8,946
2020	7,997
2021	6,874
2022	4,794
Later years (through 2046)	7,171
Total	$	47,951