Leases - Future Minimum Obligations under Topic 842 (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 51,442
2020	93,318
2021	78,005
2022	57,874
2023	43,129
Thereafter	151,103
Total lease payments	474,871
Less: imputed interest	(114,853)
Total	$ 360,018