Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
2019 - Remaining	$ 24,576
2019		$ 32,461
2020	27,599	24,630
2021	19,321	17,676
2022	11,210	10,942
2023	9,147	9,008
Thereafter	26,098	26,070
Total future minimum lease payments	117,951	120,787
Less: Imputed interest	(14,240)
Total	103,711
Finance Leases
2019 - Remaining	5,268
2019		6,430
2020	4,753	4,555
2021	4,830	4,748
2022	955	936
2023	950	936
Thereafter	3,868	3,807
Total future minimum lease payments	20,624	$ 21,412
Less: Imputed interest	(2,490)
Total	$ 18,134