Lessee Leases - Minimum Future Payments on Non-Cancelable Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Remaining six months of 2019	$ 7,239
2020	13,458
2021	12,866
2022	11,802
2023	8,409
Thereafter	27,809
Total operating lease payments	81,583
Present value adjustment	(16,060)
Total operating lease liabilities	65,523
Current lease liability	10,286	$ 10,300	$ 0
Long-term operating lease liabilities	$ 55,237	$ 59,791	$ 0
Minimum
Operating Leased Assets [Line Items]
Term of Contract (in years)	1 year
Maximum
Operating Leased Assets [Line Items]
Term of Contract (in years)	12 years