Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Recorded Unconditional Purchase Obligations

Future minimum payments for these unconditional purchase obligations as of December 31, 2018 are as follows (dollars in thousands):

Year	Amount
2019	$	99,657
2020	30,779
2021	35,649
2022	15,792
2023	14,954
Thereafter	195,095
	$	391,926