Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating
2019 (excludes the three months ended March 31, 2019)	$ 30,221
2020	32,328
2021	23,953
2022	17,242
2023	12,262
Thereafter	20,928
Total future minimum lease payments	136,934
Less: imputed interest	(21,627)
Net future minimum lease payments	115,307	$ 99,800	$ 0
Finance
2019 (excludes the three months ended March 31, 2019)	2,180
2020	1,913
2021	957
2022	957
2023	80
Thereafter	0
Total future minimum lease payments	6,087
Less: imputed interest	(327)
Net future minimum lease payments	$ 5,760