Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating
2019 (excludes the six months ended June 30, 2019)	$ 20,396
2020	33,926
2021	25,264
2022	18,186
2023	12,907
Thereafter	21,809
Total future minimum lease payments	132,488
Less: imputed interest	(18,466)
Net future minimum lease payments	114,022	$ 99,800	$ 0
Finance
2019 (excludes the six months ended June 30, 2019)	1,342
2020	1,913
2021	957
2022	957
2023	80
Thereafter	0
Total future minimum lease payments	5,249
Less: imputed interest	(274)
Net future minimum lease payments	$ 4,975