Leases - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
2019	$ 31,919
2020	30,134
2021	21,376
2022	16,054
2023	13,430
Thereafter	51,675
Less: amount of lease payment representing interest	164,588
Less: amount of lease payment representing interest	(27,140)
Present value of future minimum lease payments	137,448
Less: current obligations under leases	(35,210)	$ 0
Long-term lease obligations	102,238	0
Finance Leases
2019	1,450
2020	1,934
2021	1,936
2022	1,234
2023	0
Thereafter	0
Total minimum lease payments	6,554
Less: amount of lease payment representing interest	(856)
Present value of future minimum lease payments	5,698
Less: current obligations under leases	(1,519)
Long-term lease obligations	$ 4,179	$ 4,570