Lessee Leases Minimum Future Payments on Non-Cancelable Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Weighted average remaining lease term ( in years )	6 years 11 months 27 days
Remaining nine months of 2019	$ 10,737
2020	13,328
2021	12,831
2022	11,799
2023	8,415
Thereafter	27,832
Total operating lease payments	84,942
Present value adjustment	(17,099)
Total operating lease liabilities	67,843
Operating Lease, Liability, Current	10,373	$ 10,300	$ 0
Long-term operating lease liabilities	$ 57,470	$ 59,791	$ 0
Minimum
Operating Leased Assets [Line Items]
Weighted average remaining lease term ( in years )	1 year
Maximum
Operating Leased Assets [Line Items]
Weighted average remaining lease term ( in years )	12 years